Cocoa: Fix window title being lost when untitled

The window title was lost and could not be updated while the window did
not have NSWindowStyleMaskTitled set.

Fixes #1082.

README.md

@@ -237,6 +237,7 @@ information on what to include when reporting a bug.
 - [Cocoa] Bugfix: A hidden or disabled cursor would become visible when a user
                   notification was shown (#971,#1028)
 - [Cocoa] Bugfix: Some characters did not repeat due to Press and Hold (#1010)
+- [Cocoa] Bugfix: Window title was lost when full screen or undecorated (#1082)
 - [WGL] Added support for `WGL_EXT_colorspace` for OpenGL ES contexts
 - [WGL] Added support for `WGL_ARB_create_context_no_error`
 - [GLX] Added support for `GLX_ARB_create_context_no_error`

src/cocoa_window.m

@@ -1182,7 +1182,11 @@ void _glfwPlatformDestroyWindow(_GLFWwindow* window)
 
 void _glfwPlatformSetWindowTitle(_GLFWwindow* window, const char *title)
 {
-    [window->ns.object setTitle:[NSString stringWithUTF8String:title]];
+    NSString* string = [NSString stringWithUTF8String:title];
+    [window->ns.object setTitle:string];
+    // HACK: Set the miniwindow title explicitly as setTitle: doesn't update it
+    //       if the window lacks NSWindowStyleMaskTitled
+    [window->ns.object setMiniwindowTitle:string];
 }
 
 void _glfwPlatformSetWindowIcon(_GLFWwindow* window,
@@ -1427,6 +1431,9 @@ void _glfwPlatformSetWindowMonitor(_GLFWwindow* window,
             [window->ns.object setLevel:NSNormalWindowLevel];
 
         [window->ns.object setHasShadow:YES];
+        // HACK: Clearing NSWindowStyleMaskTitled resets and disables the window
+        //       title property but the miniwindow title property is unaffected
+        [window->ns.object setTitle:[window->ns.object miniwindowTitle]];
     }
 }