From 850bbabe56de8ce76b5237fb3dbec9788f5da5be Mon Sep 17 00:00:00 2001
From: bruvzg <7645683+bruvzg@users.noreply.github.com>
Date: Tue, 14 Jul 2020 15:09:36 +0300
Subject: [macOS] Fix window size on macOS Big Sur (title bar height is no
 longer same as menu height), use top-left corner as resize origin instead of
 bottom-left.

---
 platform/osx/display_server_osx.mm | 20 +++++++++++---------
 1 file changed, 11 insertions(+), 9 deletions(-)

diff --git a/platform/osx/display_server_osx.mm b/platform/osx/display_server_osx.mm
index 4793591b54..d7562a8860 100644
--- a/platform/osx/display_server_osx.mm
+++ b/platform/osx/display_server_osx.mm
@@ -2583,16 +2583,18 @@ void DisplayServerOSX::window_set_size(const Size2i p_size, WindowID p_window) {
 
 	Size2i size = p_size / screen_get_max_scale();
 
-	if (!wd.borderless) {
-		// NSRect used by setFrame includes the title bar, so add it to our size.y
-		CGFloat menuBarHeight = [[[NSApplication sharedApplication] mainMenu] menuBarHeight];
-		if (menuBarHeight != 0.f) {
-			size.y += menuBarHeight;
-		}
-	}
+	NSPoint top_left;
+	NSRect old_frame = [wd.window_object frame];
+	top_left.x = old_frame.origin.x;
+	top_left.y = NSMaxY(old_frame);
 
-	NSRect frame = [wd.window_object frame];
-	[wd.window_object setFrame:NSMakeRect(frame.origin.x, frame.origin.y, size.x, size.y) display:YES];
+	NSRect new_frame = NSMakeRect(0, 0, size.x, size.y);
+	new_frame = [wd.window_object frameRectForContentRect:new_frame];
+
+	new_frame.origin.x = top_left.x;
+	new_frame.origin.y = top_left.y - new_frame.size.height;
+
+	[wd.window_object setFrame:new_frame display:YES];
 
 	_update_window(wd);
 }
-- 
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