bug#20432: GDK_SCALE=2 GDK_DPI_SCALE=0.5 destroys GTK+ 3 scroll bar

[Jan D.]

Paul Eggert skrev den 2015-05-14 18:38:
> Thanks, Jan D., for looking into the problem.  It does appear to be a
> mess.  In theory I suppose Emacs should use
> gdk_screen_get_monitor_scale_factor to get the monitor scale factor; but
> in practice the situation is so messed up (and a lot of work would be
> needed to fix it) that it might not be worth bothering.
>
> By the way, on my Fedora 21 x86-64 host, setting GDK_SCALE=2
> GDK_DPI_SCALE=0.5 has no effect on emacs -Q, even with the recent
> fixes.  Perhaps this is due to the races you mentioned?

No, that just affects the initial frame size.
You should see an effect on toolbar and scroll bar size (they should be 
twice as big).  Are you compiling with Gtk+ 3.8 or later?

        Jan D.