backport x11/sdl2 fixes

4b1378f

X11: fix size/position (test video_setWindowCenteredOnDisplay)

this fix x11 backend to correctly pass video_setWindowCenteredOnDisplay()

    get border values early (eg status bar)
    wait for size/position change to get valid values

d4d26e0

testautomation_video: if SDL_SetWindowSize/Position isn't honored, we should check there is an event
x11: send the events if various occasions

test/testautomation.c

@@ -45,6 +45,9 @@ int main(int argc, char *argv[])
         return 1;
     }
 
+    /* No need of windows (or update testautomation_mouse.c:mouse_getMouseFocus() */
+    state->num_windows = 0;
+
     /* Parse commandline */
     for (i = 1; i < argc;) {
         int consumed;