process list: fix unloading

fixes #2284

quickshell/DMSShell.qml

@@ -808,10 +808,19 @@ Item {
 
         ProcessListModal {
             id: processListModal
+            property bool wasShown: false
 
             Component.onCompleted: {
                 PopoutService.processListModal = processListModal;
             }
+
+            onVisibleChanged: {
+                if (visible) {
+                    wasShown = true;
+                } else if (wasShown) {
+                    PopoutService.unloadProcessListModal();
+                }
+            }
         }
     }
 

quickshell/Services/PopoutService.qml

@@ -629,6 +629,13 @@ Singleton {
         processListModal?.hide();
     }
 
+    function unloadProcessListModal() {
+        if (processListModalLoader) {
+            processListModal = null;
+            processListModalLoader.active = false;
+        }
+    }
+
     function toggleProcessListModal() {
         if (processListModal) {
             processListModal.toggle();