Ensure ReactComponent child is rendered when view is slow to initialize

[philippjfr]

In certain scenarios views are slow to initialize (e.g. GraphicWalker, because it has to download a large bundle). In this scenario the componentDidMount hook would run but not do anything because the view was not yet ready. By ensuring that we attach the render_callback whether or not the view can be resolved ensures that it does render when the view is ready.

We also implement some fixes ensuring no child renders are triggered when children haven't changed.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.10%. Comparing base (30c0f60) to head (198208a).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8406      +/-   ##
==========================================
+ Coverage   86.08%   86.10%   +0.01%     
==========================================
  Files         349      349              
  Lines       54821    54821              
==========================================
+ Hits        47194    47203       +9     
+ Misses       7627     7618       -9     

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[github-actions]

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