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textscreen: try to create a VSync enabled renderer first (#1365)

Fall back to creating a software renderer only if that fails.

@vanfanel

--- a/textscreen/txt_sdl.c

+++ b/textscreen/txt_sdl.c

@@ -253,7 +253,13 @@

     if (TXT_SDLWindow == NULL)

         return 0;

-    renderer = SDL_CreateRenderer(TXT_SDLWindow, -1, SDL_RENDERER_SOFTWARE);

+    renderer = SDL_CreateRenderer(TXT_SDLWindow, -1, SDL_RENDERER_PRESENTVSYNC);

+

+    if (renderer == NULL)

+        renderer = SDL_CreateRenderer(TXT_SDLWindow, -1, SDL_RENDERER_SOFTWARE);

+

+    if (renderer == NULL)

+        return 0;

     // Special handling for OS X retina display. If we successfully set the

     // highdpi flag, check the output size for the screen renderer. If we get