When I use the folder quicksearch field to filter the shown folder names, and select then another folder, then the messagelist suddenly shows the content of BOTH folders - the one I had selected before and the newly selected one. E.g. I view my inbox, filter now the folders for ABC, click on ABC -> I see mails from inbox and ABC Reproducible: Always
know bug. Didn't find why it doesn't work.
*** This bug has been marked as a duplicate of bug 287685 ***