macosx: info panel: implement window toggling

Like all other panels.

modules/gui/macosx/MainMenu.m

@@ -1357,7 +1357,7 @@
 
 - (IBAction)showInformationPanel:(id)sender
 {
-    [[[VLCMain sharedInstance] currentMediaInfoPanel] showPanel];
+    [[[VLCMain sharedInstance] currentMediaInfoPanel] toggleWindow:sender];
 }
 
 #pragma mark - convinience stuff for other objects

modules/gui/macosx/VLCPlaylist.m

@@ -394,7 +394,7 @@
 
 - (IBAction)showInfoPanel:(id)sender
 {
-    [[[VLCMain sharedInstance] currentMediaInfoPanel] showPanel];
+    [[[VLCMain sharedInstance] currentMediaInfoPanel] toggleWindow:sender];
 }
 
 - (IBAction)deleteItem:(id)sender

modules/gui/macosx/VLCPlaylistInfo.h

@@ -95,7 +95,7 @@
 @property (readwrite, weak) IBOutlet NSTextField *videoDecodedTextField;
 
 - (void)updateCocoaWindowLevel:(NSInteger)i_level;
-- (void)showPanel;
+- (IBAction)toggleWindow:(id)sender;
 
 - (IBAction)metaFieldChanged:(id)sender;
 - (IBAction)saveMetaData:(id)sender;

modules/gui/macosx/VLCPlaylistInfo.m

@@ -132,11 +132,14 @@
         [self.window setLevel: i_level];
 }
 
-- (void)showPanel
+- (IBAction)toggleWindow:(id)sender
 {
-    NSInteger i_level = [[[VLCMain sharedInstance] voutController] currentStatusWindowLevel];
-    [self.window setLevel: i_level];
-    [self.window makeKeyAndOrderFront:nil];
+    if ([self.window isKeyWindow])
+        [self.window orderOut:sender];
+    else {
+        [self.window setLevel: [[[VLCMain sharedInstance] voutController] currentStatusWindowLevel]];
+        [self.window makeKeyAndOrderFront:sender];
+    }
 }
 
 - (void)initMediaPanelStats