If the MNS_CHECKORBMP style is set on a menu, and the menu is checked,
the bitmap is not drawn. For the menu tests, that means we get no
WM_DRAWITEM message for an owner-drawn bitmap, and the bounding box of
the bitmap is not tested. We should leave the menu item unchecked in
this case so we can test it.

Since those surfaces are stored in blocks, the 4 pixel step doesn't only apply to surfaces < 4, but
also to surfaces bigger than that, with a non-multiple-of-4 size.

This fbo logic appears to have already been implemented in ModifyLocation.

Uses This == dstSwapchain->frontBuffer instead as suggested by Henri Verbeet.

Handled in ActivateContext, must be remains of pre-context management code.

This prevents shader path from being entered for an offscreen surface
when there is p8 render target and fixes failures in ddraw visual test
(with opengl rendering and RTL_READDRAW mode) and visual glitches in
Red Alert.

wined3d/d3d9: Set the initial scissorrect to the dimesions of the backbuffer from the first swapchain of the device.