wayland/popupanchor: consider window size in anchor dirty state

With nonstandard edges or gravity, the compositor might not reposition
a popup when its size changes, and its unclear if its supposed to.

Author: outfoxxed

src/wayland/popupanchor.cpp

@@ -24,7 +24,7 @@ void WaylandPopupPositioner::reposition(PopupAnchor* anchor, QWindow* window, bo
 
 	// If a popup becomes invisble after creation ensure the _q properties will
 	// be set and not ignored because the rest is the same.
-	anchor->updatePlacement({popupRole != nullptr, 0}, {});
+	anchor->updatePlacement({popupRole != nullptr, 0}, window->size());
 
 	if (onlyIfDirty && !anchor->isDirty()) return;
 	anchor->markClean();