Subject: bug#21348: 25.0.50; Screen scaling factor >=2 causes menus, tooltips to display in the wrong place

From: martin rudalics <[email-masked]>
Date: Wed, 26 Aug 2015 10:56:32 +0200

>> I'm on Ubuntu 14.04.3 using a Dell XPS 13, which has screen resolution
 >> 3200x1800. In order to make the menus large enough to read, the screen
 >> is scaled at x2.
 >
 > What does that mean?  Which pixel coordinates are affected by this,
 > and how could Emacs know that?

Via gtk_widget_get_scale_factor, I suppose.

 > Sounds like some X API calls lie to us, but it's impossible to fix
 > this without knowing which ones.

In any case it will be a pain to fix this :-(

martin