From 8fcf59f883806398ca1eadda5b0222eaace25255 Mon Sep 17 00:00:00 2001
From: Max Thrun <bear24rw@gmail.com>
Date: Fri, 28 Oct 2022 23:39:29 -0700
Subject: [PATCH] Cocoa: Ignore monitors which are mirroring another

Currently monitors which are mirroring another one are returned by
`glfwGetMonitors` but their `ns.screen` is `NULL`. Some functions like
`glfwGetMonitorContentScale` and `glfwGetMonitorWorkarea` assert that
`ns.screen` is not `NULL`. Since mirrored monitors are logically the
same we should only consider the primary monitor and ignore the
non-primary ones.
---
 src/cocoa_monitor.m | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/cocoa_monitor.m b/src/cocoa_monitor.m
index 6c7315bd..48c20d4b 100644
--- a/src/cocoa_monitor.m
+++ b/src/cocoa_monitor.m
@@ -320,6 +320,9 @@ void _glfwPollMonitorsCocoa(void)
         if (CGDisplayIsAsleep(displays[i]))
             continue;
 
+        if (CGDisplayMirrorsDisplay(displays[i]) != kCGNullDirectDisplay)
+           continue;
+
         const uint32_t unitNumber = CGDisplayUnitNumber(displays[i]);
         NSScreen* screen = nil;