Rendering artifacts when resizing window.

When a window is resized, there are ghost captions that appear behind the real captions. They're static, so they're not still being drawn, but clearing the surface and spawning in a new texture also isn't clearing them. Interestingly, it's being drawn within the padding space, so it can't be the CaptionsList's doing. Is it the CaptionDialog? How do we refresh that?