Fixed regression in bug 4966 - KMSDRM: Add dynamic modeset support

Anthony Pesch

I was just communicating with one of the Retropie developers regarding this.

This change removed the forced window focus change on creation (https://github.com/inolen/SDL-mirror/commit/3534cb3793f4744509f020f1267f510ec7099366) as part of the change no longer assumes there's only a single window being created. This was perhaps an over-aggressive removal.

Due to that change, joystick events are only received if SDL_SetKeyboardFocus is called explicitly, or if the app has specified SDL_HINT_JOYSTICK_ALLOW_BACKGROUND_EVENTS.

I think that part of my change should be reverted to continue setting mouse / keyboard focus to the window being created. If SDL_WINDOW_INPUT_FOCUS is to be used as an input flag the code could be conditional, but that would still leave existing software broken.

src/video/kmsdrm/SDL_kmsdrmvideo.c

@@ -808,6 +808,10 @@ KMSDRM_CreateWindow(_THIS, SDL_Window * window)
 
     viddata->windows[viddata->num_windows++] = window;
 
+    /* Focus on the newly created window */
+    SDL_SetMouseFocus(window);
+    SDL_SetKeyboardFocus(window);
+
     return 0;
 
 error: