I copied all my files from my old webdav solution with scp to the new GroupOffice webdav dir. Since I develop some stuff and use mercurial to do versionmanagement, I also have .hg directories in use. Those files were missing via Webdav, although they did exist on the real filesystem.
I ran /usr/share/groupoffice/modules/files/scripts/sync_filesystem.php to include the directories, but that didn't help either.
The problem seems to be in line 804 in modules/files/classes/files.class.inc.php, where every directory starting with a . are skipped from the import. Please fix this. Thanks!