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0c80547e0d
Summary: While working on type conversion, I ran into a bug when multiple action groups belonging to a bundle are quickly sent. `DocData._sendActionsImpl` can set the same `linkId: this._lastActionNum` on multiple action groups before `_lastActionNum` is updated with a result from the server. Only one of these groups gets saved in `UndoStack._linkMap` so undoing a bundle misses out on some action groups. This diff associates each `linkId` key with an array of action groups instead of just one, then combines them all together when undoing. Test Plan: I've confirmed that this fixes my problem within my type conversion diff, but I haven't found a way to reproduce the general problem in master. I think the existing tests are probably fine since undo is tested extensively everywhere, but I'd also like to see if there are existing bugs which this fixes. Reviewers: georgegevoian Reviewed By: georgegevoian Differential Revision: https://phab.getgrist.com/D3223