fix the open/save query functionality #541
Merged
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Closes #540
This broke in the move to electron 8.2.5 where electron 6 changed the signature of this function to have a callback to instead use a promise interface. This modifies the show(Save|Open)Dialog functions to now utilize that promise, while still wrapping the result into the same form as was being used before where the
resolve
is given the singular filename (if there is one) while it rejects in cases where no file is selected (due to canceling) or we hit an error case.