From 6bf0edc59cc377705a44fcb30890592aaaff79c0 Mon Sep 17 00:00:00 2001
From: Akemi <der.richter@gmx.de>
Date: Thu, 9 Aug 2018 16:06:00 +0200
Subject: cocoa-cb: fix crash when no screen is available

instead of force unwrapping and chaining the optional vars in our
containsMouseLocation function, safely unwrap and guard the resulting
var.

Fixes #6062
---
 video/out/cocoa-cb/events_view.swift | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/video/out/cocoa-cb/events_view.swift b/video/out/cocoa-cb/events_view.swift
index 7cc295f362..5a84d27b2b 100644
--- a/video/out/cocoa-cb/events_view.swift
+++ b/video/out/cocoa-cb/events_view.swift
@@ -233,7 +233,7 @@ class EventsView: NSView {
             topMargin = cocoaCB.window.titleBarHeight + 1 + menuBarHeight
         }
 
-        var vF = window!.screen!.frame
+        guard var vF = window?.screen?.frame else { return false }
         vF.size.height -= topMargin
 
         let vFW = window!.convertFromScreen(vF)
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