dock: add isolate runninig apps by display option

quickshell/Common/SettingsData.qml

@@ -305,6 +305,7 @@ Singleton {
     property string dockBorderColor: "surfaceText"
     property real dockBorderOpacity: 1.0
     property int dockBorderThickness: 1
+    property bool dockIsolateDisplays: false
 
     property bool notificationOverlayEnabled: false
     property int overviewRows: 2

quickshell/Common/settings/SettingsSpec.js

@@ -204,6 +204,7 @@ var SPEC = {
     dockBorderColor: { def: "surfaceText" },
     dockBorderOpacity: { def: 1.0, coerce: percentToUnit },
     dockBorderThickness: { def: 1 },
+    dockIsolateDisplays: { def: false },
 
     notificationOverlayEnabled: { def: false },
     overviewRows: { def: 2, persist: false },

quickshell/Modules/Dock/DockApps.qml

@@ -65,10 +65,21 @@ Item {
 
                 Component.onCompleted: updateModel()
 
+                function isOnScreen(toplevel, screenName) {
+                    if (!toplevel.screens)
+                        return false;
+                    for (let i = 0; i < toplevel.screens.length; i++) {
+                        if (toplevel.screens[i].name === screenName)
+                            return true;
+                    }
+                    return false;
+                }
+
                 function updateModel() {
                     const items = [];
                     const pinnedApps = [...(SessionData.pinnedApps || [])];
-                    const sortedToplevels = CompositorService.sortedToplevels;
+                    const allToplevels = CompositorService.sortedToplevels;
+                    const sortedToplevels = (SettingsData.dockIsolateDisplays && root.dockScreen) ? allToplevels.filter(t => isOnScreen(t, root.dockScreen.name)) : allToplevels;
 
                     if (root.groupByApp) {
                         const appGroups = new Map();
@@ -296,7 +307,12 @@ Item {
         }
     }
 
-    onGroupByAppChanged: {
+    onGroupByAppChanged: repeater.updateModel()
-        repeater.updateModel();
+
+    Connections {
+        target: SettingsData
+        function onDockIsolateDisplaysChanged() {
+            repeater.updateModel();
+        }
     }
 }

quickshell/Modules/Settings/DockTab.qml

@@ -96,6 +96,13 @@ Item {
                 iconName: "apps"
                 title: I18n.tr("Behavior")
 
+                SettingsToggleRow {
+                    text: I18n.tr("Isolate Displays")
+                    description: I18n.tr("Only show windows from the current monitor on each dock")
+                    checked: SettingsData.dockIsolateDisplays
+                    onToggled: checked => SettingsData.set("dockIsolateDisplays", checked)
+                }
+
                 SettingsToggleRow {
                     text: I18n.tr("Group by App")
                     description: I18n.tr("Group multiple windows of the same app together with a window count indicator")