Ensure Background sync is not stopped when there is an active call.

It was happening since the application is foregrounded when VectorCallActivity is displayed.

changelog.d/4066.bugfix

@@ -0,0 +1 @@
+Stop incoming call ringing if the call is cancelled or answered on another session.

vector-app/src/main/java/im/vector/app/VectorApplication.kt

@@ -108,6 +108,7 @@ class VectorApplication :
     @Inject lateinit var buildMeta: BuildMeta
     @Inject lateinit var leakDetector: LeakDetector
     @Inject lateinit var vectorLocale: VectorLocale
+    @Inject lateinit var webRtcCallManager: WebRtcCallManager
 
     // font thread handler
     private var fontThreadHandler: Handler? = null
@@ -167,20 +168,33 @@ class VectorApplication :
         notificationUtils.createNotificationChannels()
 
         ProcessLifecycleOwner.get().lifecycle.addObserver(object : DefaultLifecycleObserver {
+            private var stopBackgroundSync = false
+
             override fun onResume(owner: LifecycleOwner) {
                 Timber.i("App entered foreground")
                 fcmHelper.onEnterForeground(activeSessionHolder)
-                activeSessionHolder.getSafeActiveSessionAsync {
-                    it?.syncService()?.stopAnyBackgroundSync()
+                if (webRtcCallManager.currentCall.get() == null) {
+                    Timber.i("App entered foreground and no active call: stop any background sync")
+                    activeSessionHolder.getSafeActiveSessionAsync {
+                        it?.syncService()?.stopAnyBackgroundSync()
+                    }
+                } else {
+                    Timber.i("App entered foreground: there is an active call, set stopBackgroundSync to true")
+                    stopBackgroundSync = true
                 }
-//                activeSessionHolder.getSafeActiveSession()?.also {
-//                    it.syncService().stopAnyBackgroundSync()
-//                }
             }
 
             override fun onPause(owner: LifecycleOwner) {
                 Timber.i("App entered background")
                 fcmHelper.onEnterBackground(activeSessionHolder)
+
+                if (stopBackgroundSync) {
+                    Timber.i("App entered background: stop any background sync")
+                    activeSessionHolder.getSafeActiveSessionAsync {
+                        it?.syncService()?.stopAnyBackgroundSync()
+                    }
+                    stopBackgroundSync = false
+                }
             }
         })
         ProcessLifecycleOwner.get().lifecycle.addObserver(spaceStateHandler)

vector/src/main/java/im/vector/app/features/call/webrtc/WebRtcCallManager.kt

@@ -139,6 +139,7 @@ class WebRtcCallManager @Inject constructor(
     private val rootEglBase by lazy { EglUtils.rootEglBase }
 
     private var isInBackground: Boolean = true
+    private var syncStartedWhenInBackground: Boolean = false
 
     override fun onResume(owner: LifecycleOwner) {
         isInBackground = false
@@ -274,13 +275,15 @@ class WebRtcCallManager @Inject constructor(
             peerConnectionFactory = null
             audioManager.setMode(CallAudioManager.Mode.DEFAULT)
             // did we start background sync? so we should stop it
-            if (isInBackground) {
+            if (syncStartedWhenInBackground) {
                 if (!unifiedPushHelper.isBackgroundSync()) {
+                    Timber.tag(loggerTag.value).v("Sync started when in background, stop it")
                     currentSession?.syncService()?.stopAnyBackgroundSync()
                 } else {
                     // for fdroid we should not stop, it should continue syncing
                     // maybe we should restore default timeout/delay though?
                 }
+                syncStartedWhenInBackground = false
             }
         }
     }
@@ -383,6 +386,7 @@ class WebRtcCallManager @Inject constructor(
         if (isInBackground) {
             if (!unifiedPushHelper.isBackgroundSync()) {
                 // only for push version as fdroid version is already doing it?
+                syncStartedWhenInBackground = true
                 currentSession?.syncService()?.startAutomaticBackgroundSync(30, 0)
             } else {
                 // Maybe increase sync freq? but how to set back to default values?