Save legend state #2380
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Save legend state #2380
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While we were dealing with the issues with legends and matplotlib 3.7, I noticed that we don't save the legend state of the matplotlib viewers. This PR adds functionality to do that, which gives a small but nice UX improvement. This shouldn't have any effect on loading existing sessions, since then the relevant record won't have a
"legend"key and the new code in__setgluestate__won't run.