Subject: bug#26104: 26.0.50; In Ubuntu, having mouse over other frame cause Alt key to produce a <switch-frame> event

From: martin rudalics <[email-masked]>
Date: Sun, 09 Apr 2017 08:37:41 +0200

> I changed keyboard.c and rebuilt emacs. The value for
 > lispy-switch-frame-source is focus_in_event.

Same here.  So I suggest you look into your window manager's focus
policy.  It's focus follows mouse on my machine which evidently produces
a focus-in event each time the mouse moves to another frame.

martin