feat: pause video on inactive Plasma Activities

closes: #277

Author: luisbocanegra

package/contents/ui/TasksModel.qml

@@ -34,6 +34,7 @@ Item {
     property var isFullScreen: abstractTasksModel.IsFullScreen
     property var isMinimized: abstractTasksModel.IsMinimized
     property bool activeScreenOnly: main.configuration.CheckWindowsActiveScreen
+    readonly property string currentActivity: activityInfo.currentActivity
 
     Connections {
         target: main.configuration
@@ -50,7 +51,6 @@ Item {
 
     TaskManager.ActivityInfo {
         id: activityInfo
-        readonly property string nullUuid: "00000000-0000-0000-0000-000000000000"
     }
 
     TaskManager.TasksModel {

package/contents/ui/main.qml

@@ -77,7 +77,7 @@ WallpaperItem {
         return play;
     }
     property bool playing: {
-        return ((shouldPlay && !batteryPausesVideo && !screenLocked && !screenIsOff && !effectPauseVideo) || effectPlayVideo) && videosConfig.length !== 0;
+        return ((shouldPlay && !batteryPausesVideo && !screenLocked && !screenIsOff && !effectPauseVideo && isCurrentActivity) || effectPlayVideo) && videosConfig.length !== 0;
     }
     property bool shouldBlur: {
         if (videosConfig.length == 0) {
@@ -111,6 +111,7 @@ WallpaperItem {
     property bool batteryDisablesBlur: pauseBattery && main.configuration.BatteryDisablesBlur
 
     property bool screenIsOff: screenModel.screenIsOff
+    property bool isCurrentActivity: Plasmoid.activity === windowModel.currentActivity
     property bool screenOffPausesVideo: main.configuration.ScreenOffPausesVideo
     property bool lockScreenMode: false
     property bool debugEnabled: main.configuration.DebugEnabled