fixed fullscreen handling for backgrounding

Currently when returning from background, the app is fullscreen but the video is in portrait mode.

Now when entering background we leave fullscreen and enter it again the the app is in foreground.

Signed-off-by: Toni Förster <toni.foerster@gmail.com>

Model/Player/PlayerModel.swift

@@ -56,6 +56,7 @@ final class PlayerModel: ObservableObject {
     @Published var presentingPlayer = false { didSet { handlePresentationChange() } }
     @Published var activeBackend = PlayerBackendType.mpv
     @Published var forceBackendOnPlay: PlayerBackendType?
+    @Published var wasFullscreen = false
 
     var avPlayerBackend = AVPlayerBackend()
     var mpvBackend = MPVBackend()
@@ -979,6 +980,17 @@ final class PlayerModel: ObservableObject {
                 avPlayerBackend.bindPlayerToLayer()
             }
 
+            #if os(iOS)
+                if wasFullscreen {
+                    wasFullscreen = false
+                    DispatchQueue.main.async { [weak self] in
+                        Delay.by(0.3) {
+                            self?.enterFullScreen()
+                        }
+                    }
+                }
+            #endif
+
             guard closePiPAndOpenPlayerOnEnteringForeground, playingInPictureInPicture else {
                 return
             }
@@ -993,6 +1005,15 @@ final class PlayerModel: ObservableObject {
             } else if !playingInPictureInPicture {
                 avPlayerBackend.removePlayerFromLayer()
             }
+            #if os(iOS)
+                guard playingFullScreen else { return }
+                wasFullscreen = playingFullScreen
+                DispatchQueue.main.async { [weak self] in
+                    Delay.by(0.3) {
+                        self?.exitFullScreen(showControls: false)
+                    }
+                }
+            #endif
         }
     #endif