fix(layout): don't attempt xcb hack under wayland

src/qtile_bonsai/tree.py

@@ -86,12 +86,14 @@ def render(self, screen_rect: ScreenRect, tree: "BonsaiTree"):
         self.bar_drawer.width = bar_rect.w
         self.bar_drawer.height = bar_rect.h
 
-        # NOTE: This hack is a workaround after some changes in qtile 0.23. When the
-        # drawer surface width expands, the xcb surface is freed, but not re-created.
+        # NOTE: This hack is a workaround after some changes in qtile 0.23 under X. When
+        # the drawer surface width expands, the xcb surface is freed, but not
+        # re-created. No problem under Wayland.
         # Re-creation only happens later when `drawer._check_xcb()` is invoked in
         # `drawer.draw()`. But that check doesn't happen in `drawer.clear()`, and
         # that's when we face an exception.
-        self.bar_drawer._check_xcb()
+        if hasattr(self.bar_drawer, "_check_xcb"):
+            self.bar_drawer._check_xcb()
 
         self.bar_drawer.clear(tab_bar_bg_color)