broken mouse cursor with dual screen in portrait mode

Submitted by Ben Copeland

Assigned to Olivier Fourdan @olivier

Link to original bug (#11004)

Description

Created attachment 5542 mouse_cursor_bug

I only have this when running my two screen setup. Because I have the second screen in portrait mode, it seems to get confused and I get dual mouse cursor.

It is hard to reproduce the bug, as it seems completely random.

Attachment 5542, "mouse_cursor_bug":

Version: 4.10.1