macosx: ensure that video view is always visible in fullscreen window (close #9526)

modules/gui/macosx/Windows.h

@@ -105,6 +105,8 @@ static const float f_min_video_height = 70.0;
     BOOL              b_window_is_invisible;
     NSInteger i_originalLevel;
 
+    BOOL              b_video_view_was_hidden;
+
     NSTimer *t_hide_mouse_timer;
 
     // true when the window is in transition for entering lion fullscreen

modules/gui/macosx/Windows.m

@@ -813,6 +813,10 @@
             return;
         }
 
+        /* Make sure video view gets visible in case the playlist was visible before */
+        b_video_view_was_hidden = [o_video_view isHidden];
+        [o_video_view setHidden: NO];
+
         /* Make sure we don't see the o_video_view disappearing of the screen during this operation */
         NSDisableScreenUpdates();
         [o_video_view retain];
@@ -1017,6 +1021,8 @@
     if ([[o_video_view subviews] count] > 0)
         [self makeFirstResponder: [[o_video_view subviews] objectAtIndex:0]];
 
+    [o_video_view setHidden: b_video_view_was_hidden];
+
     [super makeKeyAndOrderFront:self]; /* our version (in main window) contains a workaround */
 
     [o_fullscreen_window orderOut: self];