Fixes state issue & Uses more accurate events #14
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(1)
I removed all trailing spaces I could find, because it got annoying to work with otherwise
(2)
I looked into the sortable-tree library, because the way you fixed it, one sometimes got the tree twice, which was annoying. One case where that would happen is:
This is a bug in that library I made a PR there fixing it and added the version from my fork to this repository. I also removed the old error recovery mechanism, because it's now obsolete.
(3)
I fixed the registered event handlers to better capture all necessary events. I'm still not quite sure there but I think this now makes the tree feel more responsive.