twn_input.c: zero ctx.mouse_movement on focus lost

src/twn_input.c

@@ -234,6 +234,8 @@ void input_state_update(InputState *input) {
 
     if (ctx.window_mouse_resident)
         ctx.game.mouse_movement = input->mouse_relative_position;
+    else
+        ctx.game.mouse_movement = (Vec2){0};
 
     for (size_t i = 0; i < shlenu(input->action_hash); ++i) {
         Action *action = &input->action_hash[i].value;