Created attachment 5520 
Fix-text-shadow-value-to-silence-a-gtk3-warning.patch

Hello,

When running Gtk+ applications in XFCE, the following warning appears in the console:

    (gedit:9384): Gtk-WARNING **: Theme parsing error: gtk.css:102:18: Not using units is deprecated. Assuming 'px'.
    (gedit:9384): Gtk-WARNING **: Theme parsing error: gtk.css:102:20: Not using units is deprecated. Assuming 'px'.

A quick "strace -eopen -f gedit" shows that these warnings are triggered by this line in /usr/share/themes/Xfce/gtk-3.0/gtk.css:

    text-shadow: 1 1 white;

Replacing "1" by "1px" in such lines is enough to silence the warnings.  The attached patch does exactly this for every theme.

System information
------------------
- Distro: Arch Linux
- Package version:
  * gtk3-xfce-engine 3.0.1-1
  * gtk3 3.12.2-1
  * xfwm4 4.10.1-1

- CPU architecture: x86_64
- Kernel version: 3.14.5

--
Nicolas