270a229728
Changing the frames map would lead to a crash later in undo. This was because the `frames_storage` was not written to file corectly. When the `frames_storage` was tagged dirty, it recreated the `frames_storage.num` as well as the `keys` and `values` pointers. The `keys` and `values` pointers were written after the update, but since the `num` is just an `int` in the embeded struct, it was written before being updated. This lead to an out-of-sync state and later to the crash. The fix makes sure we write the struct *after* updating it.
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