Fix insertContents for prepending block embeds #3842
Merged
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There was a bug when the delta passed to
insertContents
starts with a block embed: The attributes of the block embed were not applied becauseinsertContents
calledformatAt
against a wrong index.This PR fixed the issue. Added a test case and also fixed an issue where in fuzz tests, we didn't generate a random doc whose first blot was block embed.