Resize maximised windows upon workspace change

Don't issue a frameGeometry update until we have fully processed which
geometry we want.

BUG: 423596

abstract_client.cpp

@@ -3064,7 +3064,7 @@ void AbstractClient::checkWorkspacePosition(QRect oldGeometry, int oldDesktop, Q
         return;
 
     if (maximizeMode() != MaximizeRestore) {
-        // TODO update geom_restore?
+        GeometryUpdatesBlocker block(this);
         changeMaximize(false, false, true);   // adjust size
         const QRect screenArea = workspace()->clientArea(ScreenArea, this);
         QRect geom = frameGeometry();