One of my coworkers wrote the following WHY comment yesterday:
// __ ___ ___ __ ___ // \ \ / / | | \ \ / / |__ \ // \ \ /\ / /| |__| |\ \_/ / ) | // \ \/ \/ / | __ | \ / / / // \ /\ / | | | | | | |_| // \/ \/ |_| |_| |_| (_) // // Because the normal ChildWindow causes a memoryleak. // The memory leak was created because the ChildWindow subscribed to the RootVisual_GotFocus multiple times...