SDL2 backend does not build on UWP

[rokups]

Version/Branch of Dear ImGui:

Version 1.91, Branch: docking

Back-ends:

imgui_impl_sdl2.cpp

Compiler, OS:

MSVC

Full config/build information:

No response

Details:

SDL2 backend uses GetWindowLong/SetWindowLong/ShowWindow windows API, which are not allowed with UWP and the build fails. It would make sense to disable code using these APIs on UWP. You can check presence of UWP build like so:

#if defined(WINAPI_FAMILY_PARTITION)
#if WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_APP) && !WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP)
// Is UWP
#endif
#endif

Screenshots/Video:

No response

Minimal, Complete and Verifiable Example code:

No response

[ocornut]

Could you provide a PR for it? (if adequate, over docking branch with 1 commit for master 1 commit for docking if needed)
We do test for UWP here and there already so can use same syntax as whatever is already in.

[ocornut]

Pushed a fix d7cedd6

[rokups]

Sorry, i did not manage to get to this in time. Thanks for the fix :)

[ocornut]

Note that I used the same logic as main lib was using: (defined(WINAPI_FAMILY) && (WINAPI_FAMILY == WINAPI_FAMILY_APP || WINAPI_FAMILY == WINAPI_FAMILY_GAMES) which differs from your proposed version.
I am not entirely sure what the FAMILY vs FAMILY_PARTITION means at this point.