Log Message:
Update wip/xfce4-wm to 4.8.3

Upstream changes:

4.8.3
=====

- Do not exit the move/resize loop when just any key is pressed unless the
  operation is triggered via the keyboard (this should be enough to fix the
  remaining part of Bug #8233)
- Reverting from desktop view may not focus the top most window (Bug #8173)
- Recompute window's position/maximization state even if the overall size of
  the screen hasn't changed as the actual layout of the monitors may have
  changed nevertheless.
- Check for both forward and backward cycling modifier to be released before
  exiting the cycle loop (Bug #6508)
- Fix a couple of memory leaks
- Fix some events being lost causing the tabwin window to remain sometimes
  after the key has been released
- Fix crash when workspace count is set to negative values (Bug #8002)
- Fix crash in signal handler
- Fix a bug with transients for group (including utility windows)
  being withdrawn as many times as parent windows where in the group, causing
  utility windows to disapear when switching workspaces (this bug was affecting
  The GIMP and reported initially bugzilla.gnome.org as bug #651454).
- Do not allow applications to change the win layer on dialogs to prevent
  dialogs to be unreachable in some Java based applications
- Do not enforce the size increment only if the size request comes
  from the application itself (refix Bug #7445)
- On docs installation, create relative paths in symlinks to images
- Translations updates: de, fi, hr, is, ko, ro, zh_CN, zh_TW