Interleave editor creation and file loading #3171
Draft
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This is an attempt to merge an optimization by @ewpatton as part of a refactor of editor handling into being screen based (a unit consisting of both form and blocks) from file based (a unit that is either form or blocks).
This code is still throwing errors, and I was unsuccessful in a more ambitious attempt to bring it more in line with the Promises update.
Throwing it up as a draft in hopes of getting some more eyes on it.