wined3d: ActivateContext caused a lot of recursive ENTER_GL calls while it is especially dangerous in here as this function can indirectly trigger GDI calls.

include: Fix the level of indirection for the umd_version parameter of the CheckInterfaceSupport method of IDXGIAdapter.

Test to verify that the scrollbar does need to be shown or hidden while
redraw is disabled.

There were some notifications that weren't sent in ME_UpdateRepaint
while redraw was disabled, so this verifies that they are not sent
with redraw disabled.