Improved Tool selection

from pRegroup2020 Improved Tool selection - I’m doing the “setState after reading Tool#activate in Paper.js” and it’s a bug where I forgot to setState. - To begin with, “Tool#activate is called by setState→useEffect” is correct. - I don’t remember where it was written, but the idea is “single source of truth”. - React should have been the single source and the Paper.js side should have been subordinate and updated when editing there.

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