content_insets fixup: consider menu height

Signed-off-by: Dietmar Maurer <[email protected]>

druid-shell/src/backend/gtk/window.rs

@@ -1021,13 +1021,14 @@ impl WindowHandle {
             let scale = state.scale.get();
             let (width_px, height_px) = state.window.size();
             let alloc_px = state.drawing_area.allocation();
+            let menu_height_px = height_px - alloc_px.height;
 
             if let Some(window) = state.window.window() {
                 let frame = window.frame_extents();
                 let (pos_x, pos_y) = window.position();
                 Insets::new(
                     (pos_x - frame.x) as f64,
-                    (pos_y - frame.y) as f64,
+                    (pos_y - frame.y + menu_height_px) as f64,
                     (frame.x + frame.width - (pos_x + width_px)) as f64,
                     (frame.y + frame.height - (pos_y + height_px)) as f64,
                 )