Add new appearance option for hiding title bar

src/MacVim/MMFullScreenWindow.m

@@ -191,6 +191,8 @@ - (void)enterFullScreen
         // we have to do it manually.
         [NSApp changeWindowsItem:self title:[target title] filename:NO];
     }
+
+    [self setAppearance:target.appearance];
 
     [self setOpaque:[target isOpaque]];
 

src/MacVim/MMVimController.m

@@ -686,11 +686,7 @@ - (void)handleMessage:(int)msgid data:(NSData *)data
         NSString *string = [[NSString alloc] initWithBytes:(void*)bytes
                 length:len encoding:NSUTF8StringEncoding];
 
-        // While in live resize the window title displays the dimensions of the
-        // window so don't clobber this with a spurious "set title" message
-        // from Vim.
-        if (![[windowController vimView] inLiveResize])
-            [windowController setTitle:string];
+        [windowController setTitle:string];
 
         [string release];
     } else if (SetDocumentFilenameMsgID == msgid) {

src/MacVim/MMWindowController.h

@@ -75,6 +75,7 @@
 - (void)setScrollbarThumbValue:(float)val proportion:(float)prop
                     identifier:(int32_t)ident;
 
+- (unsigned int)calculateStyleMask;
 - (void)setBackgroundOption:(int)dark;
 - (void)refreshApperanceMode;
 

src/MacVim/MMWindowController.m

@@ -477,6 +477,17 @@ - (void)zoomWithRows:(int)rows columns:(int)cols state:(int)state
 
 - (void)setTitle:(NSString *)title
 {
+    // Save the original title, if we haven't already.
+    [lastSetTitle release];
+    lastSetTitle = [title retain];
+
+    // While in live resize the window title displays the dimensions of the
+    // window so don't clobber this with the new title. We have already set
+    // lastSetTitle above so once live resize is done we will set it back.
+    if ([vimView inLiveResize]) {
+        return;
+    }
+
     if (!title)
         return;
 
@@ -579,40 +590,55 @@ - (void)refreshApperanceMode
     // Transparent title bar setting
     decoratedWindow.titlebarAppearsTransparent = [[NSUserDefaults standardUserDefaults]
                                                   boolForKey:MMTitlebarAppearsTransparentKey];
+
+    // No title bar setting
+    if ([[NSUserDefaults standardUserDefaults]
+            boolForKey:MMNoTitleBarWindowKey]) {
+        [decoratedWindow setStyleMask:([decoratedWindow styleMask] & ~NSWindowStyleMaskTitled)];
+    } else {
+        [decoratedWindow setStyleMask:([decoratedWindow styleMask] | NSWindowStyleMaskTitled)];
+    }
+
+    // Title may have been lost if we hid the title-bar. Reset it.
+    [self setTitle:lastSetTitle];
 
     // Dark mode only works on 10.14+ because that's when dark mode was
     // introduced.
 #if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_14
     if (@available(macos 10.14, *)) {
+        NSAppearance* desiredAppearance;
         switch ([[NSUserDefaults standardUserDefaults] integerForKey:MMAppearanceModeSelectionKey])
         {
             case MMAppearanceModeSelectionLight:
             {
-                decoratedWindow.appearance = [NSAppearance appearanceNamed: NSAppearanceNameAqua];
+                desiredAppearance = [NSAppearance appearanceNamed: NSAppearanceNameAqua];
                 break;
             }
             case MMAppearanceModeSelectionDark:
             {
-                decoratedWindow.appearance = [NSAppearance appearanceNamed: NSAppearanceNameDarkAqua];
+                desiredAppearance = [NSAppearance appearanceNamed: NSAppearanceNameDarkAqua];
                 break;
             }
             case MMAppearanceModeSelectionBackgroundOption:
             {
                 if (backgroundDark) {
-                    decoratedWindow.appearance = [NSAppearance appearanceNamed: NSAppearanceNameDarkAqua];
+                    desiredAppearance = [NSAppearance appearanceNamed: NSAppearanceNameDarkAqua];
                 } else {
-                    decoratedWindow.appearance = [NSAppearance appearanceNamed: NSAppearanceNameAqua];
+                    desiredAppearance = [NSAppearance appearanceNamed: NSAppearanceNameAqua];
                 }
                 break;
             }
             case MMAppearanceModeSelectionAuto:
             default:
             {
                 // Use the system appearance. This will also auto-switch when OS changes mode.
-                decoratedWindow.appearance = nil;
+                desiredAppearance = nil;
                 break;
             }
         }
+
+        decoratedWindow.appearance = desiredAppearance;
+        fullScreenWindow.appearance = desiredAppearance;
     }
 #endif
 }
@@ -821,11 +847,6 @@ - (void)liveResizeWillStart
 {
     if (!setupDone) return;
 
-    // Save the original title, if we haven't already.
-    if (lastSetTitle == nil) {
-        lastSetTitle = [[decoratedWindow title] retain];
-    }
-
     // NOTE: During live resize Cocoa goes into "event tracking mode".  We have
     // to add the backend connection to this mode in order for resize messages
     // from Vim to reach MacVim.  We do not wish to always listen to requests
@@ -849,8 +870,6 @@ - (void)liveResizeDidEnd
     // If we saved the original title while resizing, restore it.
     if (lastSetTitle != nil) {
         [decoratedWindow setTitle:lastSetTitle];
-        [lastSetTitle release];
-        lastSetTitle = nil;
     }
 
     // If we are in the middle of rapid resize (e.g. double-clicking on the border/corner