macosx: activate app when going to fullscreen

this fixes a really nasty window layout mixing foreign windows with
the fs controller and the video, when activating while window is inactive
(cherry picked from commit 2975e9168d3bc1844dd92aaadb0391390c7920ab)
Signed-off-by: Felix Paul Kühne <fkuehne@videolan.org>

modules/gui/macosx/MainWindow.m

@@ -2194,6 +2194,10 @@ static VLCMainWindow *_o_sharedInstance = nil;
 
 - (void)windowDidEnterFullScreen:(NSNotification *)notification
 {
+    // Indeed, we somehow can have an "inactive" fullscreen (but a visible window!).
+    // But this creates some problems when leaving fs over remote intfs, so activate app here.
+    [NSApp activateIgnoringOtherApps:YES];
+
     [o_fspanel setVoutWasUpdated: (int)[[self screen] displayID]];
     [o_fspanel setActive: nil];
 }

modules/gui/macosx/intf.m

@@ -1451,6 +1451,8 @@ unsigned int CocoaKeyToVLC( unichar i_key )
             input_thread_t * p_input = pl_CurrentInput( VLCIntf );
             if( p_input != NULL && [self activeVideoPlayback] )
             {
+                // activate app, as method can also be triggered from outside the app (prevents nasty window layout)
+                [NSApp activateIgnoringOtherApps:YES];
                 [o_mainwindow performSelectorOnMainThread:@selector(enterFullscreen) withObject:nil waitUntilDone:NO];
             }
             if (p_input)