Log Message:
xfce4-thunar: update to 1.8.12

Change log:

1.8.12
======
- NULL is the proper sentinel for g_object_new() (Bug #16310)
- Drop timer on finalize (Bug #15305)
- Store column width setting asynchronously and only once (Bug #15305)
- When move to trash fails, ask whether to delete files (Bug #15975)
- Ctrl+Mousewheel does not enlarge/shrink entries (for detailed list
view) (Bug #15936)
- Extra padding for Eject button when scrollbar is visible (Bug #15312)
- Use standard icon instead of custom
- Translation Updates: Albanian, Chinese (China), Chinese (Taiwan), Croatian,
  Czech, Dutch, French, Galician, Greek, Hungarian, Italian, Japanese,
  Norwegian Bokmål, Portuguese, Portuguese (Brazil), Russian, Serbian, Slovak,
  Spanish, Swedish, Ukrainian