Log Message:
xfce4-desktop: update to 4.13.4

Change log:

4.13.4
======
[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.

- Re-introduce ability to move icons to other displays (Bug #15198)
- Make 'Move to Trash' icon the same as Thunar (Bug #15234)
- Match Thunar Drag and Drop behavior (Bug #14919)
- Stop ongoing drag/selection if middle/right mouse button is
  pressed (Bug #14180)
- Fix Desktop icons order resets, by adding link to last used configuration as
  fallback (Bug #11266)
- Fix xfdesktop crashes after multiples --reload (Bug #15060)
- Fix scaling of images with orientation metadata (Bug #14644)
- Fix stretching/zooming of images with orientation metadata (Bug #15292)
- Fix has_mime_type implementation (Bug #15295)
- Use clipboard target "text/uri-list" when copying/cutting (Bug #13379)
- Set desktop environment for garcon app menu (Bug #14599)
- Remove faulty line in glade file (Bug #15293)
- Fix g_type_class_add_private is deprecated
- Avoid invalid memory access (Bug #15299)
- Avoid timer leak when docking-undocking monitors (Bug #13887)
- Use clipboard target "text/uri-list" when copying/cutting (Bug #13379)
- Set desktop environment for garcon app menu (Bug #14599)
- Properly center workspace header in windowlist (Bug #15405)
- Fix memory leak when monitors change (Bug #14844)
- Replace/remove deprecated functions
- Translation Updates: Albanian, Arabic, Asturian, Basque, Belarusian,
  Bulgarian, Chinese (Hong Kong), Chinese (Taiwan), Danish, English (Australia),
  English (Great Britain), Estonian, Finnish, French, Galician, Greek,
  Icelandic, Indonesian, Italian, Korean, Norwegian Bokmål, Norwegian Nynorsk,
  Occitan, Polish, Portuguese (Brazilian), Romanian, Russian, Serbian,
  Slovenian, Spanish, Uyghur