From b3d46711be253862ee73d8ed88e00eef129abbf8 Mon Sep 17 00:00:00 2001
From: ManoloFLTK <41016272+ManoloFLTK@users.noreply.github.com>
Date: Tue, 21 Apr 2020 09:45:43 +0200
Subject: Slightly improve drawing of window titlebars.

---
 src/Fl_cocoa.mm | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/Fl_cocoa.mm b/src/Fl_cocoa.mm
index 7ae551263..aded8cb4e 100644
--- a/src/Fl_cocoa.mm
+++ b/src/Fl_cocoa.mm
@@ -4377,8 +4377,10 @@ void Fl_Cocoa_Window_Driver::draw_layer_to_context(CALayer *layer, CGContextRef
 #if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_6
   CGContextSaveGState(gc);
   clip_to_rounded_corners(gc, w, h);
-  CGContextSetRGBFillColor(gc, .79, .79, .79, 1.); // equiv. to FL_DARK1
-  CGContextFillRect(gc, CGRectMake(0, 0, w, h));
+  if (fl_mac_os_version < 101500) { // exact OS threshold might be lower
+    CGContextSetRGBFillColor(gc, .79, .79, .79, 1.); // equiv. to FL_DARK1
+    CGContextFillRect(gc, CGRectMake(0, 0, w, h));
+  }
   CGContextSetShouldAntialias(gc, true);
   [layer renderInContext:gc]; // 10.5
   CGContextRestoreGState(gc);
-- 
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