Add XFCE to the X11 compatibility matrix

docs/kittens/panel.rst

@@ -204,3 +204,9 @@ Compatibility with various platforms
              - 🟢
              - 🟢
              -
+
+           * - XFCE
+             - 🟢
+             - 🟢
+             - 🟢
+             -

kitty_tests/panels.py

@@ -28,4 +28,4 @@ def r(msg: str, cmdline: str) -> None:
 r('background, check transparency and margins and no input focus',
   'panel -o background_opacity=0.2 --edge=background --margin-top=50 --margin-bottom=50 --margin-left=100 --margin-right=100')
 
-r('quake, check transparency and focus on show/re-show', 'kitten quick-access-terminal')
+r('quake, check transparency and focus on show/re-show', 'quick-access-terminal')