Fixed bug 3722 - Fall back to xinerama/xvidmode if xrandr modes initialization fails

Levi Bard

In some environments, xrandr modes initialization can fail even though xrandr support is present and of a sufficient version.
(The one I encountered was an AWS instance running a virtual display)

The attached patch allows SDL to keep trying other methods if xrandr modes initialization fails (still subject to SDL_VIDEO_X11_REQUIRE_XRANDR).

src/video/x11/SDL_x11modes.c

@@ -604,7 +604,8 @@ X11_InitModes(_THIS)
     /* require at least XRandR v1.3 */
     if (CheckXRandR(data->display, &xrandr_major, &xrandr_minor) &&
         (xrandr_major >= 2 || (xrandr_major == 1 && xrandr_minor >= 3))) {
-        return X11_InitModes_XRandR(_this);
+        if (X11_InitModes_XRandR(_this) == 0)
+            return 0;
     }
 #endif /* SDL_VIDEO_DRIVER_X11_XRANDR */