Clean up layout effects in useEditor #153
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Fixes #152.
We (I) somehow ended up with multiple layout effects trying to manage when to replace the editor view. This made it hard to ensure that the
view.dom
wasn't getting cleared out by EditorView before React did its own cleanup.This moves everything into one effect, and makes sure that we set the EditorView to null before updating to a new EditorView with the same mount (which is the case that triggers ProseMirror clearing out the mount before React has a chance to)