remember to finish all surfaces when finalizing

We need to .finalize() all surfaces when we release them, or they may keep
resources allocated in their respective backends.

Signed-off-by: Tycho Andersen <tycho@tycho.pizza>

libqtile/backend/base/drawer.py

@@ -75,9 +75,12 @@ def __init__(self, qtile: Qtile, win: Internal, width: int, height: int):
 
     def finalize(self):
         """Destructor/Clean up resources"""
-        self.background_surface = None
-        self.surface = None
-        self.last_surface = None
+        if hasattr(self, "surface"):
+            self.surface.finish()
+            delattr(self, "surface")
+        if hasattr(self, "last_surface"):
+            self.last_surface.finish()
+            delattr(self, "last_surface")
         self.ctx = None
 
     @property
@@ -109,6 +112,9 @@ def height(self, height: int):
 
     def _reset_surface(self):
         """This creates a fresh surface and cairo context."""
+        if hasattr(self, "surface"):
+            self.surface.finish()
+
         self.surface = cairocffi.RecordingSurface(
             cairocffi.CONTENT_COLOR_ALPHA,
             None,