Condense the items to squash and simplify the history from multiple calls to Append.
AnnHistory.prototype.condense = function()
condense(): void;
Condense simplifies the history from multiple calls to Append. For example, consider the following actions:
User creates Rectangle annotation R
User calls Append
User moves R
User calls Append
User deletes R
User calls Append
There are now three entries in the history:
When condensed, R is removed altogether from the history because it is no longer present.
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