fix notification dismiss: skip slideIn for already-visible popups

modules/NotifPopup.qml

@@ -31,6 +31,8 @@ PanelWindow {
         width: parent.width
         spacing: 6
 
+        property var _knownIds: ({})
+
         Repeater {
             model: M.NotifService.popups.slice(0, 4)
 
@@ -50,9 +52,16 @@ PanelWindow {
 
                 property bool _entered: false
                 Component.onCompleted: {
-                    _entered = true;
+                    if (popupCol._knownIds[modelData.id]) {
+                        opacity = 1;
+                        x = 0;
+                        _heightScale = 1;
+                    } else {
+                        popupCol._knownIds[modelData.id] = true;
                         slideIn.start();
                     }
+                    _entered = true;
+                }
 
                 Behavior on y {
                     enabled: popupItem._entered