macosx: simple prefs: Only show font family and subtype in the font panel

Other settings like font size do not have any effect and confuse users.

modules/gui/macosx/simple_prefs.h

@@ -25,7 +25,7 @@
 #import "intf.h"
 #import <vlc_common.h>
 
-@interface VLCSimplePrefs : NSObject <NSToolbarDelegate>
+@interface VLCSimplePrefs : NSObject <NSToolbarDelegate, NSWindowDelegate>
 {
     IBOutlet id o_audio_dolby_pop;
     IBOutlet id o_audio_dolby_txt;

modules/gui/macosx/simple_prefs.m

@@ -1262,7 +1262,8 @@ static inline void save_string_list(intf_thread_t * p_intf, id object, const cha
         [[NSFontManager sharedFontManager] setSelectedFont:font isMultiple:NO];
     }
     [[NSFontManager sharedFontManager] setTarget: self];
-    [[NSFontPanel sharedFontPanel] orderFront:self];
+    [[NSFontPanel sharedFontPanel] setDelegate:self];
+    [[NSFontPanel sharedFontPanel] makeKeyAndOrderFront:self];
 }
 
 - (void)changeFont:(id)sender
@@ -1272,6 +1273,11 @@ static inline void save_string_list(intf_thread_t * p_intf, id object, const cha
     [self osdSettingChanged:self];
 }
 
+- (NSUInteger)validModesForFontPanel:(NSFontPanel *)fontPanel
+{
+    return NSFontPanelFaceModeMask | NSFontPanelCollectionModeMask;
+}
+
 - (IBAction)inputSettingChanged:(id)sender
 {
     if (sender == o_input_cachelevel_pop) {