Show context menu on desktop right-click in convergence mode

Right-clicking the desktop or dock background opened the mobile
settings overlay, which is a long-press gesture for touchscreens.
In convergence mode show a popup menu instead with three items:
Desktop and Wallpaper, Add Widgets, and Configure Desktop.

Long-press still opens the settings overlay on all form factors.

containments/homescreens/folio/qml/FavouritesBar.qml

@@ -559,11 +559,14 @@ MouseArea {
     }
 
     onClicked: (mouse) => {
-        // Right-click opens settings view (wallpaper/widgets), same as long-press
         if (mouse.button === Qt.RightButton) {
+            if (convergenceMode) {
+                root.homeScreen.showDesktopContextMenu();
+            } else {
                 folio.HomeScreenState.openSettingsView();
             }
         }
+    }
 
     onDoubleClicked: {
         if (folio.FolioSettings.doubleTapToLock) {

containments/homescreens/folio/qml/FolioHomeScreen.qml

@@ -13,6 +13,7 @@ import org.kde.plasma.plasmoid 2.0
 import org.kde.plasma.components 3.0 as PC3
 import org.kde.plasma.private.mobileshell as MobileShell
 import org.kde.plasma.private.mobileshell.shellsettingsplugin as ShellSettings
+import QtQuick.Templates as T
 import plasma.applet.org.kde.plasma.mobile.homescreen.folio as Folio
 
 import "./delegate"
@@ -78,6 +79,35 @@ Item {
         Plasmoid.internalAction("configure").trigger();
     }
 
+    function showDesktopContextMenu() {
+        desktopContextMenu.popup();
+    }
+
+    PC3.Menu {
+        id: desktopContextMenu
+        popupType: T.Popup.Window
+
+        PC3.MenuItem {
+            text: i18n("Desktop and Wallpaper...")
+            icon.name: "preferences-desktop-wallpaper"
+            onTriggered: root.wallpaperSelectorTriggered()
+        }
+        PC3.MenuItem {
+            text: i18n("Add Widgets...")
+            icon.name: "widget-alternatives"
+            onTriggered: {
+                folio.HomeScreenState.openSettingsView();
+                settings.openWidgetsBrowser();
+            }
+        }
+        PC3.MenuSeparator {}
+        PC3.MenuItem {
+            text: i18n("Configure Desktop...")
+            icon.name: "settings-configure"
+            onTriggered: root.openConfigure()
+        }
+    }
+
     Keys.onPressed: (event) => {
         // The root is focused when we aren't in key navigation mode
         // Begin key navigation when arrow keys are pressed

containments/homescreens/folio/qml/HomeScreenPages.qml

@@ -7,6 +7,7 @@ import QtQuick.Layouts
 
 import org.kde.plasma.components 3.0 as PC3
 import org.kde.plasma.private.mobileshell as MobileShell
+import org.kde.plasma.private.mobileshell.shellsettingsplugin as ShellSettings
 import org.kde.kirigami as Kirigami
 import plasma.applet.org.kde.plasma.mobile.homescreen.folio as Folio
 
@@ -28,11 +29,14 @@ MouseArea {
     }
 
     onClicked: (mouse) => {
-        // Right-click opens settings view (wallpaper/widgets), same as long-press
         if (mouse.button === Qt.RightButton) {
+            if (ShellSettings.Settings.convergenceModeEnabled) {
+                root.homeScreen.showDesktopContextMenu();
+            } else {
                 folio.HomeScreenState.openSettingsView();
             }
         }
+    }
 
     onDoubleClicked: {
         if (folio.FolioSettings.doubleTapToLock) {

containments/homescreens/folio/qml/settings/SettingsComponent.qml

@@ -23,6 +23,10 @@ Item {
 
     readonly property bool homeScreenInteractive: !appletListViewer.active
 
+    function openWidgetsBrowser() {
+        appletListViewer.active = true;
+    }
+
     property real bottomMargin: 0
     property real leftMargin: 0
     property real rightMargin: 0