os_gfx -> report mouse move events; still allow passive mouse interaction if window is unfocused, but have recently received mousemove events

src/raddbg/raddbg.c

@@ -69,6 +69,14 @@ update_and_render(OS_Handle repaint_window_handle, void *user_data)
     OS_EventList new_events = os_get_events(scratch.arena, df_gfx_state->num_frames_requested == 0);
     os_event_list_concat_in_place(&events, &leftover_events_copy);
     os_event_list_concat_in_place(&events, &new_events);
+    for(OS_Event *e = events.first; e != 0; e = e->next)
+    {
+      if(e->kind == OS_EventKind_MouseMove)
+      {
+        df_gfx_state->last_time_mousemoved_us = os_now_microseconds();
+        break;
+      }
+    }
   }
   
   //- rjf: enable txti change detection