Log Message:
Update xfce4-desktop to 4.13.1:

4.13.1
======
[Please note that this is a development release.]

Development release of xfdesktop targeting for Xfce 4.14.
Please report all problems at bugzilla.xfce.org.

* Miscellaneous bug fixes:
- Fix a memory leak reported in Bug #13555
- Fix garcon-2 dependancy check (continue to use garcon-1)

* Translation Updates:
 ca da de es fr he hr id it ja kk ko ms pl
 pt pt_BR ru th uk zh_CN

4.13.0
======
[Please note that this is a development release.]

Development release of xfdesktop targeting for Xfce 4.14.
Please report all problems at bugzilla.xfce.org.

* Major changes:
 - Port to Gtk3.
  - The iconview has a CSS name of "XfdesktopIconView" and
    adds the GTK_STYLE_CLASS_VIEW to it's base. It then adds
    GTK_STYLE_CLASS_LABEL when rendering the icon text with
    the states: selected, active, or normal. Additionally it
    uses the GTK_STYLE_CLASS_RUBBERBAND when for the rubberband
    theming.
 - Port to GDBus.

* Miscellaneous bug fixes:
 - Don't redraw the icons on focus change events (Bug #12071)
 - Don't try to divide by 0 (Bug #12115)
 - Settings: Fix loading of wallpaper previews (Bug #11892)
 - Settings: Allow directories to be selected (Bug #12832)
 - Fix Open dialog's title (Bug #12560)
 - Prevent a crash in the backdrop loader (Bug #12339)
 - Use gdk's get static image for animation files
 - Add translation string for Trash desktop icon
 - Retain icon relative position when moving a group