fix(filemanager): preserve desktop selection for context menus

qml/Desktop/Main.qml

@@ -111,7 +111,10 @@ Item {
         }
 
         onActiveFocusChanged: {
-            if (!activeFocus) {
+            // The context menu is a separate popup window. Opening it moves
+            // focus away from the desktop, but the selected item must remain
+            // selected while the menu builds and handles its actions.
+            if (!activeFocus && !desktopMenu.visible) {
                 _folderView.cancelRename()
                 dirModel.clearSelection()
             }