refactor transcript view to handle HistoryCells #3538
Merged
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No (intended) functional change.
This refactors the transcript view to hold a list of HistoryCells instead of a list of Lines. This simplifies and makes much of the logic more robust, as well as laying the groundwork for future changes, e.g. live-updating history cells in the transcript.
Similar to #2879 in goal. Fixes #2755.