On repo's initial loading or refreshing, there were "dirty" pods that gets uploaded.

There are three causes, all fixed:

1. the auto-layout engine was run upon Code cell's running and layout states in useEffect, even if they are not changed. Now it is only triggered when the state is changed.
2. There were dimension change events from reactflow's onNodeChange without actual change. Now this is filtered out.
3. Rich text editor will fire a "change" event at the beginning. This is also filtered out.