Description of problem:
It is impossible to add new folders from the 'Message Filters' dialog.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Main Window: Edit -> Message Filters
2. 'Message Filters' dialog: Add
3. 'Add rule' dialog: Move to folder -> <click here to select a folder>
4 'Selct folder' dialog: New
'Create Folder' dialog appears, 'Folder name' field has focus, but you cannot type. In Fact, everything in the dialog is blocked, 'Cancel' doesn't work ether because the focus still is in the 'Select Folder' dialog below. You need to first click 'Cancel' in 'Select Folder', then you can close the 'Folder Name' dialog.
It should be possible to create net folders from the 'Add filters' dialog as it was before.
According to https://bugzilla.gnome.org/show_bug.cgi?id=593890 the problem already existed in 2.28.x, but I never noticed it.
Thanks for a bug report and finding the relevant upstream bug. As this is not Fedora specific I'm closing this as upstream, Please see the upstream bug report for more updates.