osd: reverse media playback icons and handle screen changes

quickshell/Common/OSDManager.qml

@@ -9,6 +9,20 @@ Singleton {
 
     property var currentOSDsByScreen: ({})
 
+    Connections {
+        target: Quickshell
+        function onScreensChanged() {
+            const activeNames = {};
+            for (let i = 0; i < Quickshell.screens.length; i++)
+                activeNames[Quickshell.screens[i].name] = true;
+            for (const screenName in osdManager.currentOSDsByScreen) {
+                if (activeNames[screenName])
+                    continue;
+                osdManager.currentOSDsByScreen[screenName] = null;
+            }
+        }
+    }
+
     function showOSD(osd) {
         if (!osd || !osd.screen)
             return;