macosx: fixed subtitle rendering resolution when using the native fullscreen mode (close #7946)

bug was triggered only when using controls provided by the OS like NSWindow's fullscreen button

modules/gui/macosx/VideoView.m

@@ -54,6 +54,8 @@
     if (p_vout)
         vlc_object_release(p_vout);
 
+    [[NSNotificationCenter defaultCenter] removeObserver: self];
+
     [self unregisterDraggedTypes];
     [super dealloc];
 }
@@ -67,6 +69,14 @@
     i_lastScrollWheelDirection = 0;
     f_cumulated_magnification = 0.0;
 
+#ifdef MAC_OS_X_VERSION_10_7
+    if (!OSX_SNOW_LEOPARD) {
+        [[NSNotificationCenter defaultCenter] addObserver: self selector: @selector(osWillChangeFullScreenStatus:) name: NSWindowWillEnterFullScreenNotification object: nil];
+        [[NSNotificationCenter defaultCenter] addObserver: self selector: @selector(osWillChangeFullScreenStatus:) name: NSWindowDidEnterFullScreenNotification object: nil];
+        [[NSNotificationCenter defaultCenter] addObserver: self selector: @selector(osWillChangeFullScreenStatus:) name: NSWindowWillExitFullScreenNotification object: nil];
+    }
+#endif
+
     return self;
 }
 
@@ -286,6 +296,23 @@
 #pragma mark -
 #pragma mark Basic view behaviour and touch events handling
 
+- (void)osWillChangeFullScreenStatus:(NSNotification *)notification
+{
+    playlist_t *p_playlist = pl_Get(VLCIntf);
+    if ([notification.name isEqualToString:@"NSWindowWillEnterFullScreenNotification"] || [notification.name isEqualToString:@"NSWindowDidEnterFullScreenNotification"])
+        var_SetBool(p_playlist, "fullscreen", 1);
+    else
+        var_SetBool(p_playlist, "fullscreen", 0);
+
+    NSArray *subviews = [self subviews];
+    NSUInteger count = [subviews count];
+
+    for (NSUInteger x = 0; x < count; x++) {
+        if ([[subviews objectAtIndex:x] respondsToSelector:@selector(reshape)])
+            [[subviews objectAtIndex:x] reshape];
+    }
+}
+
 - (BOOL)mouseDownCanMoveWindow
 {
     return YES;

modules/gui/macosx/intf.m

@@ -1237,9 +1237,8 @@ static VLCMain *_o_sharedMainInstance = nil;
     playlist_t * p_playlist = pl_Get(p_intf);
     BOOL b_fullscreen = i_full;
 
-    if (!var_GetBool(p_playlist, "fullscreen") != !b_fullscreen) {
+    if (!var_GetBool(p_playlist, "fullscreen") != !b_fullscreen)
         var_SetBool(p_playlist, "fullscreen", b_fullscreen);
-    }
 
     if (b_nativeFullscreenMode) {
         // this is called twice in certain situations, so only toogle if we really need to