[PATCH 0/2] MR5512: win32u: Fix calculating viewport size incorrectly.

[Haoyang Chen (＠chenhaoyang)]

Calling either SetViewportExtEx or SetWindowExtEx
fixes the viewport(MAPPING_FixIsotropic), but if both are called then it is fixed twice.
Then the mapping matrix will be incorrect and will not be calculated
using the values of viewport and wnd.