demo video

KeyEncoder mapped TAB to a plain tab regardless of Shift, so Shift+Tab sent the
same byte as Tab. Apps that use backtab for reverse navigation (fish completion
menu, helix theme picker) never saw it. Emit CSI Z when Shift is held.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
(cherry picked from commit 93d53fcef6)

.classpath

@@ -1,18 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<classpath>
-	<classpathentry kind="src" output="bin/main" path="src/main/java">
-		<attributes>
-			<attribute name="gradle_scope" value="main"/>
-			<attribute name="gradle_used_by_scope" value="main,test"/>
-		</attributes>
-	</classpathentry>
-	<classpathentry kind="src" output="bin/main" path="src/main/resources">
-		<attributes>
-			<attribute name="gradle_scope" value="main"/>
-			<attribute name="gradle_used_by_scope" value="main,test"/>
-		</attributes>
-	</classpathentry>
-	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-21/"/>
-	<classpathentry kind="con" path="org.eclipse.buildship.core.gradleclasspathcontainer"/>
-	<classpathentry kind="output" path="bin/default"/>
-</classpath>

.codexsession

@@ -1 +0,0 @@
-019e6999-b7c8-7591-a8aa-ea51b89a7f7e

.gitattributes

@@ -0,0 +1 @@
+*.mp4 filter=lfs diff=lfs merge=lfs -text

.gitignore

@@ -11,6 +11,10 @@ devenv.local.yaml
 # pre-commit
 .pre-commit-config.yaml
 build
-build
 .gradle
 bin
+.settings
+.project
+.worktrees
+.classpath
+.codexsession

.ignore

@@ -0,0 +1,4 @@
+.gradle
+bin
+result
+.worktrees

.project

@@ -1,34 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<projectDescription>
-	<name>jprototerm</name>
-	<comment>Project jprototerm created by Buildship.</comment>
-	<projects>
-	</projects>
-	<buildSpec>
-		<buildCommand>
-			<name>org.eclipse.jdt.core.javabuilder</name>
-			<arguments>
-			</arguments>
-		</buildCommand>
-		<buildCommand>
-			<name>org.eclipse.buildship.core.gradleprojectbuilder</name>
-			<arguments>
-			</arguments>
-		</buildCommand>
-	</buildSpec>
-	<natures>
-		<nature>org.eclipse.jdt.core.javanature</nature>
-		<nature>org.eclipse.buildship.core.gradleprojectnature</nature>
-	</natures>
-	<filteredResources>
-		<filter>
-			<id>1779917652126</id>
-			<name></name>
-			<type>30</type>
-			<matcher>
-				<id>org.eclipse.core.resources.regexFilterMatcher</id>
-				<arguments>node_modules|\.git|__CREATED_BY_JAVA_LANGUAGE_SERVER__</arguments>
-			</matcher>
-		</filter>
-	</filteredResources>
-</projectDescription>

.settings/org.eclipse.buildship.core.prefs

@@ -1,13 +0,0 @@
-arguments=--init-script /home/anon/Src/eclipse.jdt.ls/org.eclipse.jdt.ls.product/target/repository/configuration/org.eclipse.osgi/58/0/.cp/gradle/init/init.gradle
-auto.sync=false
-build.scans.enabled=false
-connection.gradle.distribution=GRADLE_DISTRIBUTION(LOCAL_INSTALLATION(/home/anon/.sdkman/candidates/gradle/current))
-connection.project.dir=
-eclipse.preferences.version=1
-gradle.user.home=
-java.home=/nix/store/c3pl7bqrx3d2rc3dh98z6yaj0mv1p52g-openjdk-21.0.10+7/lib/openjdk
-jvm.arguments=
-offline.mode=false
-override.workspace.settings=true
-show.console.view=true
-show.executions.view=true

config.example.toml

@@ -30,3 +30,4 @@ next_floating = "ALT+F12"
 close_pane = "ALT+X"
 open_font_selector = "ALT+T"
 open_scrollback = "ALT+S"
+paste = "CTRL+SHIFT+V"

devenv.lock

@@ -1,65 +0,0 @@
-{
-  "nodes": {
-    "devenv": {
-      "locked": {
-        "dir": "src/modules",
-        "lastModified": 1779749056,
-        "narHash": "sha256-AtocdrunzuxTvSDn+82RntEhrs6TicM6Z4/zNQS9KKg=",
-        "owner": "cachix",
-        "repo": "devenv",
-        "rev": "099ac65fcef79e88127bdc06adbd1ea94255274a",
-        "type": "github"
-      },
-      "original": {
-        "dir": "src/modules",
-        "owner": "cachix",
-        "repo": "devenv",
-        "type": "github"
-      }
-    },
-    "nixpkgs": {
-      "inputs": {
-        "nixpkgs-src": "nixpkgs-src"
-      },
-      "locked": {
-        "lastModified": 1778507786,
-        "narHash": "sha256-HzSQCKMsMr8r55LwM1JuzIOB+8bzk0FEv6sItKvsfoY=",
-        "owner": "cachix",
-        "repo": "devenv-nixpkgs",
-        "rev": "8f24a228a782e24576b155d1e39f0d914b380691",
-        "type": "github"
-      },
-      "original": {
-        "owner": "cachix",
-        "ref": "rolling",
-        "repo": "devenv-nixpkgs",
-        "type": "github"
-      }
-    },
-    "nixpkgs-src": {
-      "flake": false,
-      "locked": {
-        "lastModified": 1778274207,
-        "narHash": "sha256-I4puXmX1iovcCHZlRmztO3vW0mAbbRvq4F8wgIMQ1MM=",
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "b3da656039dc7a6240f27b2ef8cc6a3ef3bccae7",
-        "type": "github"
-      },
-      "original": {
-        "owner": "NixOS",
-        "ref": "nixpkgs-unstable",
-        "repo": "nixpkgs",
-        "type": "github"
-      }
-    },
-    "root": {
-      "inputs": {
-        "devenv": "devenv",
-        "nixpkgs": "nixpkgs"
-      }
-    }
-  },
-  "root": "root",
-  "version": 7
-}

devenv.nix

@@ -1,66 +0,0 @@
-{ pkgs, lib, config, inputs, ... }:
-
-let
-  system = pkgs.stdenv.hostPlatform.system;
-
-  jlibghostty = builtins.getFlake
-    "git+https://gitea.gregorlohaus.com/gregor/jlibghostty.git";
-
-  jlib = jlibghostty.packages.${system}.jlibghostty;
-  hostNvidiaLibs = ".devenv/host-nvidia-libs";
-in
-{
-  packages = [
-    pkgs.git
-    pkgs.gradle_9
-    pkgs.jdk25
-    pkgs.jdt-language-server
-    pkgs.openjfx
-
-    pkgs.glib
-    pkgs.xorg.libXxf86vm
-    pkgs.xorg.libXrender
-    pkgs.xorg.libXtst
-    pkgs.xorg.libXi
-    pkgs.xorg.libXrandr
-
-    pkgs.libGL
-    pkgs.gtk3
-    pkgs.alsa-lib
-    pkgs.mesa-demos
-  ];
-
-  env.LD_LIBRARY_PATH = "${hostNvidiaLibs}:" + lib.makeLibraryPath [
-    pkgs.openjfx
-
-    pkgs.glib
-    pkgs.xorg.libXxf86vm
-    pkgs.xorg.libXrender
-    pkgs.xorg.libXtst
-    pkgs.xorg.libXi
-    pkgs.xorg.libXrandr
-
-    pkgs.libGL
-    pkgs.gtk3
-    pkgs.alsa-lib
-  ] + ":/usr/lib/x86_64-linux-gnu/nvidia/current";
-  env.__GLX_VENDOR_LIBRARY_NAME = "nvidia";
-  env.__EGL_VENDOR_LIBRARY_FILENAMES = "/usr/share/glvnd/egl_vendor.d/10_nvidia.json";
-  env.JLIBGHOSTTY_MAVEN_REPO = "${jlib}/maven";
-
-  enterShell = ''
-    mkdir -p ${hostNvidiaLibs}
-    for lib in \
-      /usr/lib/x86_64-linux-gnu/libnvidia*.so* \
-      /usr/lib/x86_64-linux-gnu/libGLX_nvidia.so* \
-      /usr/lib/x86_64-linux-gnu/libEGL_nvidia.so* \
-      /usr/lib/x86_64-linux-gnu/nvidia/current/libnvidia*.so* \
-      /usr/lib/x86_64-linux-gnu/nvidia/current/libGLX_nvidia.so* \
-      /usr/lib/x86_64-linux-gnu/nvidia/current/libEGL_nvidia.so*
-    do
-      if [ -e "$lib" ]; then
-        ln -sfn "$lib" ${hostNvidiaLibs}/"$(basename "$lib")"
-      fi
-    done
-  '';
-}

devenv.yaml

@@ -1,18 +0,0 @@
-# yaml-language-server: $schema=https://devenv.sh/devenv.schema.json
-inputs:
-  nixpkgs:
-    url: github:cachix/devenv-nixpkgs/rolling
-
-# If you're using non-OSS software, you can set allowUnfree to true.
-# allowUnfree: true
-
-# If you're not willing to allow unsupported packages:
-# allowUnsupportedSystem: false
-
-# If you're willing to use a package that's vulnerable
-# permittedInsecurePackages:
-#  - "openssl-1.1.1w"
-
-# If you have more than one devenv you can merge them
-#imports:
-# - ./backend

flake.lock

@@ -70,11 +70,11 @@
         "nixpkgs": "nixpkgs"
       },
       "locked": {
-        "lastModified": 1780079529,
-        "narHash": "sha256-AxlGTL8c5xSLcQHvWlm994IdOqxsN8iKrA02Cpv7vso=",
+        "lastModified": 1780272954,
+        "narHash": "sha256-bVWY60iw8yPIu7I8FuRPf06T0H1TDvQDVUlzeHQs8UA=",
         "ref": "refs/heads/main",
-        "rev": "68121d50b52fb56038871c97c97e7a12ffe987c2",
-        "revCount": 20,
+        "rev": "06a9d5d3ecf11c58f0e41214d1b59900e672dd3a",
+        "revCount": 24,
         "type": "git",
         "url": "https://gitea.gregorlohaus.com/gregor/jlibghostty.git"
       },

src/main/java/com/gregor/jprototerm/AppConfig.java

@@ -38,12 +38,14 @@ public record AppConfig(
             "toggle_floating",
             "new_pane",
             "next_floating",
+            "promote_floating",
             "close_pane",
             "new_tab",
             "previous_tab",
             "next_tab",
             "open_font_selector",
-            "open_scrollback"
+            "open_scrollback",
+            "paste"
     );
 
     public static AppConfig load() {
@@ -97,12 +99,14 @@ public record AppConfig(
                         Map.entry("toggle_floating", KeyBinding.parse("ALT+F")),
                         Map.entry("new_pane", KeyBinding.parse("ALT+N")),
                         Map.entry("next_floating", KeyBinding.parse("ALT+F12")),
+                        Map.entry("promote_floating", KeyBinding.parse("ALT+P")),
                         Map.entry("close_pane", KeyBinding.parse("ALT+X")),
                         Map.entry("new_tab", KeyBinding.parse("ALT+A")),
                         Map.entry("previous_tab", KeyBinding.parse("ALT+SHIFT+H")),
                         Map.entry("next_tab", KeyBinding.parse("ALT+SHIFT+L")),
                         Map.entry("open_font_selector", KeyBinding.parse("ALT+T")),
-                        Map.entry("open_scrollback", KeyBinding.parse("ALT+S"))
+                        Map.entry("open_scrollback", KeyBinding.parse("ALT+S")),
+                        Map.entry("paste", KeyBinding.parse("CTRL+SHIFT+V"))
                 )
         );
     }

src/main/java/com/gregor/jprototerm/Compositor.java

@@ -5,6 +5,7 @@ import dev.jlibghostty.MouseButton;
 import dev.jlibghostty.MouseEncoderSize;
 import dev.jlibghostty.MouseInput;
 import javafx.geometry.VPos;
+import javafx.scene.Node;
 import javafx.scene.canvas.Canvas;
 import javafx.scene.canvas.GraphicsContext;
 import javafx.scene.input.InputEvent;
@@ -38,6 +39,8 @@ public final class Compositor {
     private static final double TAB_BAR_HEIGHT = 22.0;
 
     private final Canvas canvas = new Canvas();
+    // Kitty images are drawn as retained nodes layered over the canvas, not composited onto it.
+    private final KittyImageOverlay imageOverlay = new KittyImageOverlay();
     private final AppConfig config;
     private final TerminalMetrics metrics;
     private final List<Tab> tabs = new ArrayList<>();
@@ -75,6 +78,11 @@ public final class Compositor {
         return canvas;
     }
 
+    /** The kitty-image overlay, to be stacked directly above {@link #canvas()} in the window. */
+    public Node imageOverlay() {
+        return imageOverlay.node();
+    }
+
     public void setFont(String family, double size) {
         metrics.setFont(family, size);
         paneContentVersion.clear();
@@ -113,6 +121,16 @@ public final class Compositor {
         layoutVersion++;
     }
 
+    /** Opens a new floating pane, makes it active, and returns it (null when no tab exists). */
+    public TerminalPane openFloatingPane() {
+        if (isEmpty()) {
+            return null;
+        }
+        TerminalPane pane = currentTab().createFloatingPane();
+        layoutVersion++;
+        return pane;
+    }
+
     public void nextFloatingPane() {
         if (isEmpty()) {
             return;
@@ -121,6 +139,14 @@ public final class Compositor {
         layoutVersion++;
     }
 
+    public void promoteActiveFloating() {
+        if (isEmpty()) {
+            return;
+        }
+        currentTab().promoteActiveFloating();
+        layoutVersion++;
+    }
+
     public void closeActivePane() {
         if (isEmpty()) {
             return;
@@ -138,7 +164,10 @@ public final class Compositor {
     }
 
     public void newTab() {
-        tabs.add(new Tab(config, metrics));
+        // Open the new tab in the currently active pane's working directory, so it lands where the
+        // user currently is rather than always in home.
+        String workingDirectory = isEmpty() ? null : currentTab().activePane().currentWorkingDirectory();
+        tabs.add(new Tab(config, metrics, workingDirectory));
         currentTabIndex = tabs.size() - 1;
         layoutVersion++;
     }
@@ -244,9 +273,9 @@ public final class Compositor {
             drawTabBar(gc, canvas.getWidth(), topInset);
         }
         for (TerminalPane pane : panes) {
-            pane.paintFull(gc, isActive(pane));
-            paneContentVersion.put(pane, pane.contentVersion());
+            paneContentVersion.put(pane, pane.paintFull(gc, isActive(pane)));
         }
+        imageOverlay.sync(panes);
     }
 
     // Repaint just the panes whose content changed, directly on the retained canvas. Each pane
@@ -262,8 +291,8 @@ public final class Compositor {
             if (drawn != null && drawn == pane.contentVersion()) {
                 continue;
             }
-            pane.paintIncremental(gc, isActive(pane));
-            paneContentVersion.put(pane, pane.contentVersion());
+            paneContentVersion.put(pane, pane.paintIncremental(gc, isActive(pane)));
+            imageOverlay.updatePane(pane);
         }
     }
 
@@ -384,7 +413,10 @@ public final class Compositor {
             double ey = localY(event.getY(), pane, target);
             KeyModifiers modifiers = modifiers(event);
             for (int i = 0; i < rows; i++) {
-                sent |= send(pane, target, MouseInput.press(wheelButton, ex, ey, modifiers), mouseButtonPressed, event);
+                if (!send(pane, target, MouseInput.press(wheelButton, ex, ey, modifiers), mouseButtonPressed, event)) {
+                    break;
+                }
+                sent = true;
             }
         }
         if (!sent) {

src/main/java/com/gregor/jprototerm/KeyEncoder.java

@@ -26,7 +26,7 @@ final class KeyEncoder {
         return switch (code) {
             case ENTER -> "\r";
             case BACK_SPACE -> "\u007f";
-            case TAB -> "\t";
+            case TAB -> event.isShiftDown() ? "\u001b[Z" : "\t";
             case ESCAPE -> "\u001b";
             case UP -> "\u001b[A";
             case DOWN -> "\u001b[B";

src/main/java/com/gregor/jprototerm/KittyImageNode.java

@@ -0,0 +1,32 @@
+package com.gregor.jprototerm;
+
+import javafx.scene.image.Image;
+
+/**
+ * A single kitty image to display, produced by the renderer and consumed by {@link
+ * KittyImageOverlay}. Images are not painted onto the canvas; each becomes a retained
+ * {@code ImageView} node positioned over the pane. The {@code source*} fields are the region of
+ * {@link #image()} to show (in image pixels); the {@code x/y/width/height} are where to put it,
+ * in scene coordinates (the same space the pane's clip {@code Shape} lives in).
+ *
+ * <p>{@code imageId}+{@code placementId} identify the placement so the overlay can reuse the
+ * same node across frames instead of recreating it.
+ */
+record KittyImageNode(
+        long imageId,
+        long placementId,
+        Image image,
+        double sourceX,
+        double sourceY,
+        double sourceWidth,
+        double sourceHeight,
+        double x,
+        double y,
+        double width,
+        double height
+) {
+    /** Stable per-pane key for node reuse. Packs the two u32 ids without collision. */
+    long key() {
+        return (imageId << 32) | (placementId & 0xffffffffL);
+    }
+}

src/main/java/com/gregor/jprototerm/KittyImageOverlay.java

@@ -0,0 +1,151 @@
+package com.gregor.jprototerm;
+
+import javafx.geometry.Rectangle2D;
+import javafx.scene.Group;
+import javafx.scene.Node;
+import javafx.scene.image.ImageView;
+import javafx.scene.layout.Pane;
+import javafx.scene.shape.Rectangle;
+import javafx.scene.shape.Shape;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+/**
+ * Renders kitty graphics images as retained scene-graph nodes layered over the {@link Compositor}
+ * canvas, instead of compositing them onto the canvas. Each pane gets a {@link Group} clipped to
+ * that pane's region (the same clip {@code Shape} the canvas renderer uses), and each visible
+ * image placement is an {@link ImageView} inside it, reused across frames so an unchanged image
+ * costs nothing to redraw.
+ *
+ * <p>The overlay {@link #node()} is mouse-transparent and sits above the canvas in the window's
+ * {@code StackPane}; its children use scene coordinates, which line up with the canvas because
+ * both fill the same root.
+ */
+final class KittyImageOverlay {
+    private final Pane root = new Pane();
+    private final Map<TerminalPane, PaneOverlay> overlays = new HashMap<>();
+
+    KittyImageOverlay() {
+        // Input belongs to the canvas underneath; the overlay only shows pixels.
+        root.setMouseTransparent(true);
+        root.setManaged(false);
+    }
+
+    Node node() {
+        return root;
+    }
+
+    /**
+     * Full reconcile to {@code panes} (bottom-to-top): drop overlays for panes that went away,
+     * refresh each surviving/added pane's images and clip, and order the per-pane groups to match
+     * the pane z-order. Called on layout frames, after the panes have painted.
+     */
+    void sync(List<TerminalPane> panes) {
+        Iterator<Map.Entry<TerminalPane, PaneOverlay>> it = overlays.entrySet().iterator();
+        while (it.hasNext()) {
+            Map.Entry<TerminalPane, PaneOverlay> entry = it.next();
+            if (!panes.contains(entry.getKey())) {
+                root.getChildren().remove(entry.getValue().group);
+                it.remove();
+            }
+        }
+        for (TerminalPane pane : panes) {
+            updatePane(pane);
+        }
+        // Only panes that actually have images get a group; order those to match pane z-order.
+        List<Node> ordered = new ArrayList<>(panes.size());
+        for (TerminalPane pane : panes) {
+            PaneOverlay overlay = overlays.get(pane);
+            if (overlay != null) {
+                ordered.add(overlay.group);
+            }
+        }
+        if (!root.getChildren().equals(ordered)) {
+            root.getChildren().setAll(ordered);
+        }
+    }
+
+    /**
+     * Refresh one pane's images and clip (called on content frames for each repainted pane).
+     * Creates the pane's group if this is the first time it has shown an image.
+     */
+    void updatePane(TerminalPane pane) {
+        List<KittyImageNode> images = pane.kittyImages();
+        PaneOverlay overlay = overlays.get(pane);
+        if (overlay == null) {
+            if (images.isEmpty()) {
+                return;
+            }
+            overlay = new PaneOverlay();
+            overlays.put(pane, overlay);
+            root.getChildren().add(overlay.group);
+        }
+        overlay.group.setClip(clipFor(pane));
+        reconcile(overlay, images);
+    }
+
+    private static void reconcile(PaneOverlay overlay, List<KittyImageNode> images) {
+        Set<Long> seen = new HashSet<>();
+        for (KittyImageNode node : images) {
+            long key = node.key();
+            seen.add(key);
+            ImageView view = overlay.views.get(key);
+            if (view == null) {
+                view = new ImageView();
+                view.setManaged(false);
+                view.setSmooth(true);
+                view.setPreserveRatio(false);
+                overlay.views.put(key, view);
+                overlay.group.getChildren().add(view);
+            }
+            apply(view, node);
+        }
+        if (overlay.views.size() == seen.size()) {
+            return;
+        }
+        Iterator<Map.Entry<Long, ImageView>> it = overlay.views.entrySet().iterator();
+        while (it.hasNext()) {
+            Map.Entry<Long, ImageView> entry = it.next();
+            if (!seen.contains(entry.getKey())) {
+                overlay.group.getChildren().remove(entry.getValue());
+                it.remove();
+            }
+        }
+    }
+
+    private static void apply(ImageView view, KittyImageNode node) {
+        if (view.getImage() != node.image()) {
+            view.setImage(node.image());
+        }
+        view.setViewport(new Rectangle2D(node.sourceX(), node.sourceY(), node.sourceWidth(), node.sourceHeight()));
+        view.setFitWidth(node.width());
+        view.setFitHeight(node.height());
+        view.setLayoutX(node.x());
+        view.setLayoutY(node.y());
+    }
+
+    // The pane's occlusion clip when one is set (rect minus covering panes), else the pane's
+    // plain bounds so an image can't spill outside its pane. Matches Tab's pixel snapping.
+    private static Shape clipFor(TerminalPane pane) {
+        Shape clip = pane.clip();
+        if (clip != null) {
+            return clip;
+        }
+        return new Rectangle(Math.round(pane.x()), Math.round(pane.y()), pane.width(), pane.height());
+    }
+
+    private static final class PaneOverlay {
+        private final Group group = new Group();
+        private final Map<Long, ImageView> views = new HashMap<>();
+
+        private PaneOverlay() {
+            group.setManaged(false);
+        }
+    }
+}

src/main/java/com/gregor/jprototerm/LinuxPty.java

@@ -9,6 +9,9 @@ import java.lang.foreign.MemorySegment;
 import java.lang.foreign.SymbolLookup;
 import java.lang.foreign.ValueLayout;
 import java.lang.invoke.MethodHandle;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Map;
@@ -74,6 +77,7 @@ public final class LinuxPty implements AutoCloseable {
     private static final long SPAWN_ACTIONS_SIZE = 256;
     private static final long SPAWN_ATTR_SIZE = 512;
 
+    private static final MethodHandle TCGETPGRP = handle("tcgetpgrp", FD_INT_INT);
     private static final MethodHandle POSIX_OPENPT = handle("posix_openpt", FD_INT_INT);
     private static final MethodHandle GRANTPT = handle("grantpt", FD_INT_INT);
     private static final MethodHandle UNLOCKPT = handle("unlockpt", FD_INT_INT);
@@ -97,6 +101,7 @@ public final class LinuxPty implements AutoCloseable {
 
     private final Arena arena = Arena.ofShared();
     private final MemorySegment readBuffer = arena.allocate(65536);
+    private final MemorySegment writeBuffer = arena.allocate(65536);
     private final Object writeLock = new Object();
     private final int masterFd;
     private final int pid;
@@ -186,21 +191,43 @@ public final class LinuxPty implements AutoCloseable {
             return;
         }
         synchronized (writeLock) {
-            try (Arena a = Arena.ofConfined()) {
-                MemorySegment buf = a.allocate(data.length);
-                MemorySegment.copy(data, 0, buf, ValueLayout.JAVA_BYTE, 0, data.length);
-                long offset = 0;
-                while (offset < data.length) {
-                    long n = callLong(WRITE, masterFd, buf.asSlice(offset), data.length - offset);
-                    if (n < 0) {
+            int offset = 0;
+            while (offset < data.length) {
+                int chunk = (int) Math.min(writeBuffer.byteSize(), data.length - offset);
+                MemorySegment.copy(data, offset, writeBuffer, ValueLayout.JAVA_BYTE, 0, chunk);
+
+                long written = 0;
+                while (written < chunk) {
+                    long n = callLong(WRITE, masterFd, writeBuffer.asSlice(written), chunk - written);
+                    if (n <= 0) {
                         throw new IllegalStateException("write to pty failed");
                     }
-                    offset += n;
+                    written += n;
                 }
+                offset += chunk;
             }
         }
     }
 
+    /**
+     * Best-effort current working directory of the terminal's foreground process group, read from
+     * {@code /proc}. This tracks the directory the user is actually in (a {@code cd} in the shell,
+     * or a child program that changed dir), so a newly opened pane can start there. Falls back to
+     * the shell's own pid, and returns {@code null} if it cannot be determined.
+     */
+    public String currentWorkingDirectory() {
+        if (closed) {
+            return null;
+        }
+        int pgid = callInt(TCGETPGRP, masterFd);
+        int target = pgid > 0 ? pgid : pid;
+        try {
+            return Files.readSymbolicLink(Path.of("/proc", Integer.toString(target), "cwd")).toString();
+        } catch (IOException | RuntimeException ex) {
+            return null;
+        }
+    }
+
     /** Resizes the terminal window. */
     public void setWinSize(int columns, int rows) {
         if (closed) {

src/main/java/com/gregor/jprototerm/Main.java

@@ -3,6 +3,7 @@ package com.gregor.jprototerm;
 import javafx.animation.AnimationTimer;
 import javafx.application.Application;
 import javafx.application.Platform;
+import javafx.geometry.Rectangle2D;
 import javafx.scene.Scene;
 import javafx.scene.control.ButtonType;
 import javafx.scene.control.ComboBox;
@@ -10,15 +11,18 @@ import javafx.scene.control.Dialog;
 import javafx.scene.control.Label;
 import javafx.scene.control.Spinner;
 import javafx.scene.control.SpinnerValueFactory;
+import javafx.scene.input.Clipboard;
 import javafx.scene.input.KeyEvent;
 import javafx.scene.layout.GridPane;
 import javafx.scene.layout.StackPane;
 import javafx.scene.text.Font;
+import javafx.stage.Screen;
 import javafx.stage.Stage;
 
 import java.io.IOException;
 import java.nio.file.Files;
 import java.nio.file.Path;
+import java.util.List;
 
 public final class Main extends Application {
     private Compositor compositor;
@@ -32,7 +36,7 @@ public final class Main extends Application {
         metrics = new TerminalMetrics(config.fontFamily(), config.fontSize());
         compositor = new Compositor(config, metrics);
 
-        StackPane root = new StackPane(compositor.canvas());
+        StackPane root = new StackPane(compositor.canvas(), compositor.imageOverlay());
         compositor.canvas().widthProperty().bind(root.widthProperty());
         compositor.canvas().heightProperty().bind(root.heightProperty());
 
@@ -52,10 +56,37 @@ public final class Main extends Application {
         stage.setOnCloseRequest(event -> {
             compositor.close();
         });
+        // JavaFX centres a new stage on the primary screen; on X11 there's no "focused monitor"
+        // to honour, so place it on the screen under the mouse pointer instead.
+        centreOnActiveScreen(stage, config.windowWidth(), config.windowHeight());
         stage.show();
+        // Ask the window manager to raise and focus the new window so the user can type right
+        // away; the canvas requestFocus() below only routes events within the scene.
+        stage.toFront();
+        stage.requestFocus();
         compositor.canvas().requestFocus();
     }
 
+    // Centre the stage within the screen the mouse pointer is on (the best proxy for the
+    // "active" monitor on X11, which exposes no focused-monitor concept to JavaFX).
+    private static void centreOnActiveScreen(Stage stage, double width, double height) {
+        Rectangle2D bounds = activeScreen().getVisualBounds();
+        stage.setX(bounds.getMinX() + ((bounds.getWidth() - width) / 2.0));
+        stage.setY(bounds.getMinY() + ((bounds.getHeight() - height) / 2.0));
+    }
+
+    private static Screen activeScreen() {
+        int[] at = X11Pointer.query();
+        if (at != null) {
+            // libX11 and JavaFX share a coordinate space on the X11 virtual screen.
+            List<Screen> screens = Screen.getScreensForRectangle(at[0], at[1], 1.0, 1.0);
+            if (!screens.isEmpty()) {
+                return screens.get(0);
+            }
+        }
+        return Screen.getPrimary();
+    }
+
     private void handlePressed(KeyEvent event) {
         if (config.keybindings().get("navigate_left").matches(event)) {
             compositor.navigate(Direction.LEFT);
@@ -78,6 +109,9 @@ public final class Main extends Application {
         } else if (config.keybindings().get("next_floating").matches(event)) {
             compositor.nextFloatingPane();
             event.consume();
+        } else if (config.keybindings().get("promote_floating").matches(event)) {
+            compositor.promoteActiveFloating();
+            event.consume();
         } else if (config.keybindings().get("close_pane").matches(event)) {
             compositor.closeActivePane();
             event.consume();
@@ -101,6 +135,9 @@ public final class Main extends Application {
         } else if (config.keybindings().get("open_scrollback").matches(event)) {
             openScrollbackInEditor();
             event.consume();
+        } else if (config.keybindings().get("paste").matches(event)) {
+            pasteFromClipboard();
+            event.consume();
         } else {
             String encoded = KeyEncoder.encode(event);
             if (encoded != null) {
@@ -122,6 +159,13 @@ public final class Main extends Application {
         }
     }
 
+    private void pasteFromClipboard() {
+        Clipboard clipboard = Clipboard.getSystemClipboard();
+        if (clipboard.hasString()) {
+            compositor.activePane().paste(clipboard.getString());
+        }
+    }
+
     private void openFontSelector() {
         Dialog<ButtonType> dialog = new Dialog<>();
         dialog.setTitle("Font");
@@ -167,11 +211,16 @@ public final class Main extends Application {
 
     private void openScrollbackInEditor() {
         try {
+            // Capture the active pane's scrollback before opening the floating pane, since that
+            // makes the new pane active.
             Path file = Files.createTempFile("jprototerm-scrollback-", ".txt");
             Files.writeString(file, compositor.activePane().scrollbackText());
             file.toFile().deleteOnExit();
 
-            compositor.activePane().send(scrollbackEditorCommand(file) + "\r");
+            TerminalPane pane = compositor.openFloatingPane();
+            if (pane != null) {
+                pane.send(scrollbackEditorCommand(file) + "\r");
+            }
         } catch (IOException ex) {
             System.err.println("Could not open scrollback in editor: " + ex.getMessage());
         }

src/main/java/com/gregor/jprototerm/ShellSession.java

@@ -20,7 +20,8 @@ public final class ShellSession implements AutoCloseable {
         });
     }
 
-    public static ShellSession start(String shell, Map<String, String> envOverride, TerminalPane pane, int columns, int rows) {
+    public static ShellSession start(String shell, Map<String, String> envOverride, TerminalPane pane,
+            int columns, int rows, String workingDirectory) {
         try {
             Map<String, String> environment = new HashMap<>(System.getenv());
             environment.put("TERM", "xterm-kitty");
@@ -31,7 +32,7 @@ public final class ShellSession implements AutoCloseable {
             LinuxPty pty = LinuxPty.spawn(
                     new String[] {shell, "-i"},
                     environment,
-                    System.getProperty("user.home"));
+                    workingDirectory != null ? workingDirectory : System.getProperty("user.home"));
             ShellSession session = new ShellSession(pty);
             session.resize(columns, rows);
             return session;
@@ -69,6 +70,11 @@ public final class ShellSession implements AutoCloseable {
         reader.submit(() -> readOutput(pane));
     }
 
+    /** Best-effort current working directory of the running shell, or {@code null} if unknown. */
+    public String currentWorkingDirectory() {
+        return closed ? null : pty.currentWorkingDirectory();
+    }
+
     public void resize(int columns, int rows) {
         if (closed) {
             return;

src/main/java/com/gregor/jprototerm/Tab.java

@@ -6,6 +6,7 @@ import javafx.scene.shape.Shape;
 import java.util.ArrayList;
 import java.util.Comparator;
 import java.util.List;
+import java.util.concurrent.atomic.AtomicLong;
 import java.util.stream.Stream;
 
 /**
@@ -22,6 +23,7 @@ final class Tab implements AutoCloseable {
     private final List<TerminalPane> floating = new ArrayList<>();
     private boolean floatingVisible;
     private TerminalPane active;
+    private final String initialWorkingDirectory;
     // The floating pane to re-focus when the group is shown again, and to prefer when promoting
     // after the last tiled pane closes.
     private TerminalPane lastFocusedFloating;
@@ -33,13 +35,22 @@ final class Tab implements AutoCloseable {
     private double lastTopInset;
     // Bumped whenever one of this tab's panes changes content; the compositor reads the current
     // tab's value each frame as an O(1) "anything to repaint?" check.
-    private long contentVersion;
+    private final AtomicLong contentVersion = new AtomicLong();
 
     Tab(AppConfig config, TerminalMetrics metrics) {
+        this(config, metrics, null);
+    }
+
+    /**
+     * Creates a tab whose first pane starts in {@code initialWorkingDirectory} (e.g. the cwd of the
+     * pane that was active when this tab was opened), or the user's home when {@code null}.
+     */
+    Tab(AppConfig config, TerminalMetrics metrics, String initialWorkingDirectory) {
         this.config = config;
         this.metrics = metrics;
         this.lastWidth = config.windowWidth();
         this.lastHeight = config.windowHeight();
+        this.initialWorkingDirectory = initialWorkingDirectory;
         TerminalPane first = openPane(false);
         tiled.add(first);
         active = first;
@@ -54,7 +65,7 @@ final class Tab implements AutoCloseable {
     }
 
     long contentVersion() {
-        return contentVersion;
+        return contentVersion.get();
     }
 
     /**
@@ -211,6 +222,22 @@ final class Tab implements AutoCloseable {
         setActive(floating.get((current + 1 + floating.size()) % floating.size()));
     }
 
+    /** Promotes the active floating pane to a tiled pane, joining the tiled row. No-op otherwise. */
+    void promoteActiveFloating() {
+        TerminalPane promote = active;
+        if (!floating.remove(promote)) {
+            return; // active pane is tiled (or there is none); nothing to promote
+        }
+        if (promote == lastFocusedFloating) {
+            lastFocusedFloating = floating.isEmpty() ? null : floating.get(floating.size() - 1);
+        }
+        tiled.add(promote);
+        if (floating.isEmpty()) {
+            floatingVisible = false;
+        }
+        setActive(promote);
+    }
+
     void closeActivePane() {
         TerminalPane closing = active;
         boolean wasFloating = floating.remove(closing);
@@ -256,11 +283,12 @@ final class Tab implements AutoCloseable {
         }
     }
 
-    private void createFloatingPane() {
+    TerminalPane createFloatingPane() {
         TerminalPane pane = openPane(true);
         floating.add(pane);
         floatingVisible = true;
         setActive(pane);
+        return pane;
     }
 
     private boolean navigateFloatingStack(Direction direction) {
@@ -291,7 +319,7 @@ final class Tab implements AutoCloseable {
     }
 
     private void markContentChanged() {
-        contentVersion++;
+        contentVersion.incrementAndGet();
     }
 
     private TerminalPane openPane(boolean asFloating) {
@@ -306,7 +334,11 @@ final class Tab implements AutoCloseable {
             widthPx = lastWidth / (tiled.size() + 1);
             heightPx = availHeight;
         }
-        return TerminalPane.create(config, metrics, this::markContentChanged, widthPx, heightPx);
+        // Open the new pane in the active pane's working directory, so a split/new pane lands
+        // where the user currently is. With no active pane yet (the tab's first pane), fall back to
+        // the directory this tab was opened in. null (cwd unknown) falls back to home downstream.
+        String workingDirectory = active != null ? active.currentWorkingDirectory() : initialWorkingDirectory;
+        return TerminalPane.create(config, metrics, this::markContentChanged, widthPx, heightPx, workingDirectory);
     }
 
     private static boolean directionFilter(Direction direction, TerminalPane current, TerminalPane candidate) {

src/main/java/com/gregor/jprototerm/TerminalPane.java

@@ -16,6 +16,7 @@ import javafx.scene.canvas.GraphicsContext;
 import javafx.scene.shape.Shape;
 
 import java.util.Optional;
+import java.util.concurrent.atomic.AtomicLong;
 
 /**
  * One terminal: owns its ghostty {@link Terminal}, the {@link ShellSession}/pty driving it,
@@ -49,7 +50,7 @@ public final class TerminalPane implements AutoCloseable, RenderTarget {
     private int rows;
     private int pixelWidth;
     private int pixelHeight;
-    private long contentVersion;
+    private final AtomicLong contentVersion = new AtomicLong();
     private long snapshotVersion = -1;
 
     private TerminalPane(Terminal terminal, TerminalMetrics metrics, boolean kittyEnabled,
@@ -68,9 +69,11 @@ public final class TerminalPane implements AutoCloseable, RenderTarget {
      * columns and rows fit, and that grid is handed to ghostty and the shell at start-up. A
      * non-positive size falls back to the configured default grid (used before the first
      * layout, when no rect is known yet). The pane owns the shell session it starts and runs
-     * {@code onContentChange} on every content change.
+     * {@code onContentChange} on every content change. The shell starts in {@code workingDirectory}
+     * (e.g. the active pane's cwd), or the user's home when {@code null}.
      */
-    public static TerminalPane create(AppConfig config, TerminalMetrics metrics, Runnable onContentChange, double widthPx, double heightPx) {
+    public static TerminalPane create(AppConfig config, TerminalMetrics metrics, Runnable onContentChange,
+            double widthPx, double heightPx, String workingDirectory) {
         int columns = widthPx > 0 ? metrics.columnsFor(widthPx) : config.columns();
         int rows = heightPx > 0 ? metrics.rowsFor(heightPx) : config.rows();
         Terminal terminal = Ghostty.open(new TerminalOptions(columns, rows, config.maxScrollback()));
@@ -78,7 +81,7 @@ public final class TerminalPane implements AutoCloseable, RenderTarget {
         TerminalPane pane = new TerminalPane(terminal, metrics, config.kittyGraphics(), onContentChange,
                 new GhosttyTerminalRenderer(metrics), columns, rows);
         pane.refresh();
-        pane.attach(ShellSession.start(config.shell(), config.envOverride(), pane, columns, rows));
+        pane.attach(ShellSession.start(config.shell(), config.envOverride(), pane, columns, rows, workingDirectory));
         return pane;
     }
 
@@ -114,6 +117,19 @@ public final class TerminalPane implements AutoCloseable, RenderTarget {
         }
     }
 
+    /**
+     * Paste text to the shell: ghostty sanitises it (stripping anything that could smuggle in
+     * control sequences) and wraps it in the bracketed-paste markers, then it goes to the pty
+     * like typed input. We always request bracketed mode — every modern shell and editor enables
+     * DECSET 2004, and the jlibghostty API does not expose querying the terminal's live mode.
+     */
+    public void paste(String text) {
+        if (text == null || text.isEmpty()) {
+            return;
+        }
+        send(Ghostty.encodePaste(text, true));
+    }
+
     public boolean sendMouse(MouseInput input, MouseEncoderSize size, boolean anyButtonPressed) {
         synchronized (terminal) {
             mouseEncoder.syncFromTerminal(terminal);
@@ -169,16 +185,17 @@ public final class TerminalPane implements AutoCloseable, RenderTarget {
 
     private RenderStateSnapshot takeSnapshot(boolean full) {
         synchronized (terminal) {
+            long version = contentVersion.get();
             if (full) {
                 renderState.update(terminal);
                 cachedSnapshot = renderState.snapshot();
                 renderState.resetDirty();
-                snapshotVersion = contentVersion;
-            } else if (snapshotVersion != contentVersion) {
+                snapshotVersion = version;
+            } else if (snapshotVersion != version) {
                 renderState.update(terminal);
                 cachedSnapshot = renderState.snapshotIncremental();
                 renderState.resetDirty();
-                snapshotVersion = contentVersion;
+                snapshotVersion = version;
             }
             return cachedSnapshot;
         }
@@ -190,9 +207,15 @@ public final class TerminalPane implements AutoCloseable, RenderTarget {
         }
     }
 
+    /** Best-effort current working directory of this pane's shell, or {@code null} if unknown. */
+    public String currentWorkingDirectory() {
+        ShellSession current = session;
+        return current != null ? current.currentWorkingDirectory() : null;
+    }
+
     /** This pane's own content revision, bumped on every change (see {@link #refresh()}). */
     public long contentVersion() {
-        return contentVersion;
+        return contentVersion.get();
     }
 
     @Override
@@ -276,18 +299,28 @@ public final class TerminalPane implements AutoCloseable, RenderTarget {
         // Mark this pane's content dirty (the snapshot is computed lazily in the paint path,
         // so a burst of writes collapses into one snapshot per frame) and tell the owning tab
         // one of its panes changed.
-        contentVersion++;
+        contentVersion.incrementAndGet();
         onContentChange.run();
     }
 
     /** Paint the whole pane; see {@link TerminalRenderer#paintFull}. */
-    public void paintFull(GraphicsContext gc, boolean active) {
+    public long paintFull(GraphicsContext gc, boolean active) {
         renderer.paintFull(gc, this, active);
+        return snapshotVersion;
     }
 
     /** Repaint what changed; see {@link TerminalRenderer#paintIncremental}. */
-    public void paintIncremental(GraphicsContext gc, boolean active) {
+    public long paintIncremental(GraphicsContext gc, boolean active) {
         renderer.paintIncremental(gc, this, active);
+        return snapshotVersion;
+    }
+
+    /**
+     * Kitty image placements from the most recent paint, in scene coordinates. The compositor
+     * renders these as overlay nodes clipped to this pane (see {@link KittyImageOverlay}).
+     */
+    public java.util.List<KittyImageNode> kittyImages() {
+        return renderer.kittyImages();
     }
 
     @Override

src/main/java/com/gregor/jprototerm/TerminalRenderer.java

@@ -25,6 +25,14 @@ abstract class TerminalRenderer {
     /** Repaint only what changed since the last frame, clipped to the target's clip region. */
     abstract void paintIncremental(GraphicsContext gc, RenderTarget target, boolean active);
 
+    /**
+     * The kitty image placements produced by the most recent paint, for the compositor to render
+     * as overlay nodes above the canvas. Empty unless the last paint found visible images.
+     */
+    java.util.List<KittyImageNode> kittyImages() {
+        return java.util.List.of();
+    }
+
     protected static void clipRect(GraphicsContext gc, double x, double y, double width, double height) {
         gc.beginPath();
         gc.rect(x, y, width, height);

src/main/java/com/gregor/jprototerm/X11Pointer.java

@@ -0,0 +1,66 @@
+package com.gregor.jprototerm;
+
+import java.lang.foreign.Arena;
+import java.lang.foreign.FunctionDescriptor;
+import java.lang.foreign.Linker;
+import java.lang.foreign.MemorySegment;
+import java.lang.foreign.SymbolLookup;
+import java.lang.invoke.MethodHandle;
+
+import static java.lang.foreign.ValueLayout.ADDRESS;
+import static java.lang.foreign.ValueLayout.JAVA_INT;
+import static java.lang.foreign.ValueLayout.JAVA_LONG;
+
+/**
+ * Reads the X11 pointer location directly via libX11 ({@code XQueryPointer}). Unlike AWT's
+ * {@code MouseInfo}, this never calls {@code XSetErrorHandler}, so it doesn't trip GDK's
+ * "XSetErrorHandler called with a GDK error trap pushed" warning when JavaFX's GTK backend is
+ * already up. Returns {@code null} when not on X11 or libX11 can't be loaded.
+ */
+final class X11Pointer {
+    private X11Pointer() {
+    }
+
+    /** {@code {x, y}} of the pointer in X root-window (virtual screen) space, or {@code null}. */
+    static int[] query() {
+        try (Arena arena = Arena.ofConfined()) {
+            Linker linker = Linker.nativeLinker();
+            SymbolLookup x11 = SymbolLookup.libraryLookup("libX11.so.6", arena);
+            MethodHandle openDisplay = linker.downcallHandle(x11.find("XOpenDisplay").orElseThrow(),
+                    FunctionDescriptor.of(ADDRESS, ADDRESS));
+            MethodHandle defaultRootWindow = linker.downcallHandle(x11.find("XDefaultRootWindow").orElseThrow(),
+                    FunctionDescriptor.of(JAVA_LONG, ADDRESS));
+            MethodHandle queryPointer = linker.downcallHandle(x11.find("XQueryPointer").orElseThrow(),
+                    FunctionDescriptor.of(JAVA_INT, ADDRESS, JAVA_LONG,
+                            ADDRESS, ADDRESS, ADDRESS, ADDRESS, ADDRESS, ADDRESS, ADDRESS));
+            MethodHandle closeDisplay = linker.downcallHandle(x11.find("XCloseDisplay").orElseThrow(),
+                    FunctionDescriptor.of(JAVA_INT, ADDRESS));
+
+            MemorySegment display = (MemorySegment) openDisplay.invoke(MemorySegment.NULL);
+            if (display.address() == 0) {
+                return null;
+            }
+            try {
+                long root = (long) defaultRootWindow.invoke(display);
+                MemorySegment rootReturn = arena.allocate(JAVA_LONG);
+                MemorySegment childReturn = arena.allocate(JAVA_LONG);
+                MemorySegment rootX = arena.allocate(JAVA_INT);
+                MemorySegment rootY = arena.allocate(JAVA_INT);
+                MemorySegment winX = arena.allocate(JAVA_INT);
+                MemorySegment winY = arena.allocate(JAVA_INT);
+                MemorySegment mask = arena.allocate(JAVA_INT);
+                int onSameScreen = (int) queryPointer.invoke(display, root,
+                        rootReturn, childReturn, rootX, rootY, winX, winY, mask);
+                if (onSameScreen == 0) {
+                    return null;
+                }
+                return new int[] { rootX.get(JAVA_INT, 0), rootY.get(JAVA_INT, 0) };
+            } finally {
+                closeDisplay.invoke(display);
+            }
+        } catch (Throwable ignored) {
+            // Not X11, libX11 missing, or the call failed — caller falls back to the primary screen.
+            return null;
+        }
+    }
+}