Avoid rcube_session::reload() to reset previous changes. This fixes parallel attachment uploads that could get lost when using the database_attachments plugin
Merge branch 'master' of github.com:roundcube/roundcubemail
Better handling of fopen() errors
Fix operations on folders with trailing spaces in name (#1489419)
Fix archive button state (i.e. checking if current folder is archive folder)
Fix categories/groups import from csv