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Merge pull request #1397 from tpoppins/sdl2-alttab-fix

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

--- 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 || ver.patch == 16))

+        {

+           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);