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I'm sorry I'm always making a bunch of different changes into a big PR.
This PR attempts to fix a few issues and does some other minor tweaks I've found necessary while experimenting.
Add methods Dialogic.History.open_history() and Dialogic.History.close_history() that will emit open_requested and close_requested signals for any history layer to listen too (the default one does so now). fixes A method for opening/closing the History #1979
fix for Error if the first Text Event has no speaker #1998
fix for Issue reparenting a nested Choice event #1993
fix for Add duplicate option in the event right click menu #1994