feat: move window to adjacent monitor on repeated half tiling

tiling-assistant@leleat-on-github/prefs.js

@@ -73,6 +73,7 @@ export default class Prefs extends ExtensionPreferences {
             'show-layout-panel-indicator',
             'enable-advanced-experimental-features',
             'disable-tile-groups',
+            'move-to-adjacent-monitor',
             'low-performance-move-mode',
             'enable-layout-picker',
             'monitor-switch-grace-period',

tiling-assistant@leleat-on-github/schemas/org.gnome.shell.extensions.tiling-assistant.gschema.xml

@@ -232,6 +232,10 @@
 		<key name="disable-tile-groups" type="b">
 			<default>false</default>
 		</key>
+		<key name="move-to-adjacent-monitor" type="b">
+			<!-- Repeating tile left/right half moves the window to the adjacent monitor -->
+			<default>false</default>
+		</key>
 		<key name="default-move-mode" type="i">
 			<!-- 0: Edge Tiling, 1: Adaptive Tiling, 2: Favorite Layout, 3: Ignore TA -->
 			<default>0</default>

tiling-assistant@leleat-on-github/src/extension/keybindingHandler.js

@@ -217,6 +217,10 @@ export default class TilingKeybindingHandler {
             Twm.toggleTiling(window, rect, { ignoreTA: true });
         // Tile a window
         } else {
+            if (Settings.getBoolean('move-to-adjacent-monitor') &&
+                this._moveToAdjacentMonitor(window, shortcutName))
+                return;
+
             const dynamicSetting = Settings.getInt('dynamic-keybinding-behavior');
             const windowsStyle = DynamicKeybindings.TILING_STATE_WINDOWS;
             const isWindowsStyle = dynamicSetting === windowsStyle;
@@ -324,6 +328,72 @@ export default class TilingKeybindingHandler {
         });
     }
 
+    /**
+     * Rectangle-style monitor traversal: repeating 'tile left/right half' on a
+     * window that already fills that side of its monitor moves it to the
+     * adjacent monitor in that direction, tiled to the opposite half. Past the
+     * last monitor it wraps around to the far monitor on the other side.
+     *
+     * @param {Meta.Window} window a Meta.Window.
+     * @param {string} shortcutName the shortcut.
+     * @returns {boolean} whether the shortcut was handled.
+     */
+    _moveToAdjacentMonitor(window, shortcutName) {
+        const isLeft = shortcutName === 'tile-left-half';
+        if (!isLeft && shortcutName !== 'tile-right-half')
+            return false;
+
+        if (!window.isTiled || !window.tiledRect)
+            return false;
+
+        const workArea = new Rect(window.get_work_area_current_monitor());
+        const wRect = window.tiledRect;
+        const isFullHeight =
+            wRect.y === workArea.y &&
+            wRect.height === workArea.height;
+        const isOnThatSide = isLeft
+            ? wRect.x === workArea.x && wRect.width !== workArea.width
+            : wRect.x2 === workArea.x2 && wRect.x !== workArea.x;
+        if (!isFullHeight || !isOnThatSide)
+            return false;
+
+        const monitor = window.get_monitor();
+        const direction = isLeft ? Meta.DisplayDirection.LEFT : Meta.DisplayDirection.RIGHT;
+        let target = global.display.get_monitor_neighbor_index(monitor, direction);
+        if (target === -1)
+            target = this._getFarthestMonitor(monitor, isLeft ? Meta.DisplayDirection.RIGHT : Meta.DisplayDirection.LEFT);
+
+        // Single monitor: nowhere to go, but don't untile either.
+        if (target === monitor)
+            return true;
+
+        const targetWorkArea = new Rect(window.get_work_area_for_monitor(target));
+        const oppositeHalf = isLeft ? 'tile-right-half' : 'tile-left-half';
+        const rect = Twm.getTileFor(oppositeHalf, targetWorkArea, target);
+        Twm.tile(window, rect, { monitorNr: target }).catch(logError);
+        return true;
+    }
+
+    /**
+     * @param {number} monitor the monitor index to start from.
+     * @param {Meta.DisplayDirection} direction the direction to walk in.
+     * @returns {number} the last monitor reached by following neighbors from
+     *      `monitor` in `direction`, or `monitor` itself if it has none.
+     */
+    _getFarthestMonitor(monitor, direction) {
+        let farthest = monitor;
+        // Bounded by the monitor count in case neighbors ever form a cycle.
+        for (let i = 0; i < global.display.get_n_monitors(); i++) {
+            const next = global.display.get_monitor_neighbor_index(farthest, direction);
+            if (next === -1)
+                break;
+
+            farthest = next;
+        }
+
+        return farthest;
+    }
+
     /**
      * Changes the tiling state of the `window` based on its current tiling
      * state and the activated shortcut.

tiling-assistant@leleat-on-github/src/ui/prefs.ui

@@ -294,6 +294,20 @@
         </object>
       </child>
       <!-- ======================================================================================== -->
+      <!-- = Group: Multi-Monitor ================================================================= -->
+      <!-- ======================================================================================== -->
+      <child>
+        <object class="AdwPreferencesGroup">
+          <property name="title" translatable="yes" comments="Translators: This is the header for a preference group in the 'General' tab">Multi-Monitor</property>
+          <child>
+            <object class="AdwSwitchRow" id="move_to_adjacent_monitor">
+              <property name="title" translatable="yes" comments="Translators: This is a setting in the 'Multi-Monitor' preference group in the 'General' tab">Move to Adjacent Monitor on Repeat</property>
+              <property name="subtitle" translatable="yes" comments="Translators: This is the explanation for the 'Move to Adjacent Monitor on Repeat' setting in the 'General' tab">Tiling a window to the left or right half again moves it to the next monitor in that direction, tiled to the opposite half, wrapping around past the last monitor.</property>
+            </object>
+          </child>
+        </object>
+      </child>
+      <!-- ======================================================================================== -->
       <!-- = Group: Focus Hint ==================================================================== -->
       <!-- ======================================================================================== -->
       <child>