Filters don't work when folder name contains space character

[Markus1978]

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 address, quoting the offending address roughly like this "some_number_path/to/folder/firstword%20secondword"

I tried to rename folders to eliminate the space character shown as %20. That solved the problem for me and filters run.

If spaces are allowed in the IMAP standard, evolution should be able to handle them.
If not, it should provide a meaningful message to the user suggesting to rename the offending folder(s).

Thanks to the team,

Markus

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: evolution 3.26.1-1
ProcVersionSignature: Ubuntu 4.13.0-16.19-generic 4.13.4
Uname: Linux 4.13.0-16-generic x86_64
ApportVersion: 2.20.7-0ubuntu3.1
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Mon Nov 6 20:29:08 2017
InstallationDate: Installed on 2017-10-21 (15 days ago)
InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20171018)
SourcePackage: evolution
UpgradeStatus: No upgrade log present (probably fresh install)

[Markus1978 (mk-cactus)]

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