Deep copy inherited style #1850
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Summary
When a row is inserted with inherited style, the style of the inserted row is immutable but the style should be mutable.
This PR solves #1813.
Test plan
Related to source code (for typings update)
Typings update is not required.
Note
I did not implement general deep-copy function because it's too complex for the purpose and the structure of style is known.
However, depending on the known structure weakens resistance to change of style structure so I think the style should be implemented as class with clone method for logic coherent in the future.