From 408c595eb8d5edfa823d2857c7eda903130b222d Mon Sep 17 00:00:00 2001
From: michi_cc <michi_cc@openttd.org>
Date: Mon, 5 Aug 2013 20:35:49 +0000
Subject: [PATCH] (svn r25658) -Fix [FS#4392]: [OSX] The mouse cursor would
 sometimes jump near the window borders. (Matthieu)

---
 src/video/cocoa/wnd_quartz.mm | 17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

diff --git a/src/video/cocoa/wnd_quartz.mm b/src/video/cocoa/wnd_quartz.mm
index 9914b97c97..4274c2ca40 100644
--- a/src/video/cocoa/wnd_quartz.mm
+++ b/src/video/cocoa/wnd_quartz.mm
@@ -514,8 +514,21 @@ CGPoint WindowQuartzSubdriver::PrivateLocalToCG(NSPoint *p)
 
 NSPoint WindowQuartzSubdriver::GetMouseLocation(NSEvent *event)
 {
-	NSPoint pt = [ event locationInWindow ];
-	pt = [ this->cocoaview convertPoint:pt fromView:nil ];
+	NSPoint pt;
+
+	if (event.window == nil) {
+#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_7
+		if ([ this->cocoaview respondsToSelector:@selector(convertRectFromScreen:) ]) {
+			pt = [ this->cocoaview convertPoint:[ [ this->cocoaview window ] convertRectFromScreen:NSMakeRect([ event locationInWindow ].x, [ event locationInWindow ].y, 0, 0) ].origin fromView:nil ];
+		}
+		else
+#endif
+		{
+			pt = [ this->cocoaview convertPoint:[ [ this->cocoaview window ] convertScreenToBase:[ event locationInWindow ] ] fromView:nil ];
+		}
+	} else {
+		pt = [ event locationInWindow ];
+	}
 
 	pt.y = this->window_height - pt.y;