Log Message:
xfce4-tumbler: update to 0.2.3:

0.2.3
=====
- Test sparse files only for regular files (bug #14693).
- Fix uninitialized variable (bug #14688)

0.2.2
=====
- Added check to avoid sparse files, that cause high cpu and
  memory load. (bug #12259).
- Use hash table to avoid scanning xdg user path twice when
  searching for desktop thumbnailers.
- Close desktop thumbnailers directory when done from it.
- Accept network paths in ffmpeg thumbnailer plugin.
- Use pkg-config to find FreeType > 2.9.1.
- Translation Updates: Czech, Finnish, Hungarian, Italian,
  Greek and English (Australia).