- Calculate changes in the client area relative to the window
  instead of its parent when using SWP_EX_PAINTSELF.
- With SWP_EX_PAINTSELF, copy only if client area changed, since a
  window can't move relative to itself.
- In SWP_DoNCCalcSize, when determining if the client area
  changed, use values relative to the window itself, not its parent.

1 file changed