Gtk warnings when running qemu with the Breeze-dark theme
I get the following warnings:
(qemu-system-i386:2963505): Gtk-WARNING **: 16:33:20.035: Theme parsing error: gtk.css:1649:16: '-gtk-icon-size' is not a valid property name
(qemu-system-i386:2963505): Gtk-WARNING **: 16:33:20.036: Theme parsing error: gtk.css:1652:16: '-gtk-icon-size' is not a valid property name
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This is solved by commenting out some lines from the file:
/usr/share/themes/Breeze-Dark/gtk-3.0/gtk.css
which comes from your package.
The lines are commented are 1647-1653 and they are:
.normal-icons { -gtk-icon-size: 16px; }