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Fixes Alt+Tab bug with SDL2 v2.0.14+ on Windows

Fixes #1396.

Adapted from kraflab's [coelckers/prboom-plus@74e8a55](https://github.com/coelckers/prboom-plus/commit/74e8a5542a1d1fc2ddfe370102fb0ece1a92d033), based on a fix in Woof taken from Doom Retro.

--- a/src/i_video.c

+++ b/src/i_video.c

@@ -1349,6 +1349,18 @@

                                 SDL_TEXTUREACCESS_STREAMING,

                                 SCREENWIDTH, SCREENHEIGHT);

+    // Workaround for SDL 2.0.14+ alt-tab bug (taken from Doom Retro via Prboom-plus and Woof)

+#if defined(_WIN32)

+    {

+        SDL_version ver;

+        SDL_GetVersion(&ver);

+        if (ver.major == 2 && ver.minor == 0 && ver.patch >= 14)

+        {

+           SDL_SetHintWithPriority(SDL_HINT_VIDEO_MINIMIZE_ON_FOCUS_LOSS, "1", SDL_HINT_OVERRIDE);

+        }

+    }

+#endif

+

     // Initially create the upscaled texture for rendering to screen

     CreateUpscaledTexture(true);