Index: src/video/cocoa_v.mm
===================================================================
--- src/video/cocoa_v.mm	(Revision 10404)
+++ src/video/cocoa_v.mm	(Arbeitskopie)
@@ -1131,6 +1134,7 @@
 
 static const char* QZ_SetVideoWindowed(uint width, uint height)
 {
+	int titleBarHeight = 22; // Height of title bar of window
 	char caption[50];
 	NSString *nsscaption;
 	unsigned int style;
@@ -1184,10 +1188,17 @@
 		/* We already have a window, just change its size */
 		if (!isCustom) {
 			[ _cocoa_video_data.window setContentSize:contentRect.size ];
+			// Ensure frame height - title bar height >= view height
+			contentRect.size.height = clamp(height, 0, [ _cocoa_video_data.window frame ].size.height - titleBarHeight);
+			height = contentRect.size.height;
 			[ _cocoa_video_data.qdview setFrameSize:contentRect.size ];
 		}
 	}
 
+	// Update again
+	_cocoa_video_data.width = width;
+	_cocoa_video_data.height = height;
+
 	[ _cocoa_video_data.window center ];
 
 	/* Only recreate the view if it doesn't already exist */