Log Message:
xfce4-clipman-plugin: update to 1.6.3

Change log:

1.6.3 (2023-03-20)
=====
- Update copyright year and bug report address
- history: Fix inactive copy button (Fixes #54)
- Shorten the selection text in menu
- Move text shorten code to common function
- build: Fix autotools warnings
- Allow to clear history when only selection is visible
- Fix blurry images in plugin menu when UI scale > 1
- Fix link in README
- Remove ENABLE_NLS ifdefs
- Update `.gitignore`
- Add primary clipboard persistence
- [PATCH] build: Fix intltool lock file problem during make distcheck
- Fix text preview
- Replace `g_malloc0()` with safer alternative `g_new0()`
- Use `filename` before freeing it
- Fix invalid "Show full history..." menu item behavior (#29)
- Fix GLib macro expansion compiler warnings
- Update copyright year
- Check if already running before adding as panel plugin
- Do not try to register application twice
- Correctly handle a timeout source life cycle within a function
- Fix Gtk-CRITICAL when showing main menu
- Require glib 2.60
- Translation Updates:
  Albanian, Armenian (Armenia), Basque, Belarusian, Bulgarian, Catalan,
  Chinese (China), Chinese (Taiwan), Croatian, Czech, Danish, Dutch,
  Eastern Armenian, English (Australia), Estonian, Finnish, French,
  Galician, German, Greek, Hebrew, Hungarian, Icelandic, Indonesian,
  Interlingue, Italian, Japanese, Kazakh, Korean, Lithuanian, Malay,
  Norwegian Bokmål, Occitan (post 1500), Polish, Portuguese,
  Portuguese (Brazil), Russian, Serbian, Slovak, Slovenian, Spanish,
  Swedish, Thai, Turkish, Ukrainian