Update:
The above only seems to apply to top level folders if several folders are
nested inside each other.
I have (second level) subfolders containing spaces in their names where nothing
happens when a Filter is applied
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Public bug reported:
I have set up several folders on an imap account to organize my mail and
wrote some filter rules, mainly to move incoming mail to those folders.
When filters are run that point to a folder whose name contains spaces,
i get an error message complaining about an invalid folder