I have several special folders starting with an underscore. Thunderbird and K9 Mail sort these to the beginning of the list but Roundcube seems to completely ignore the underscore.
Another example would be the following list for which the sort order seems weird to me:
a_abbb
aa_bbb
aa_ccc
aa_ddd
a_ccc
a_ddd
I found that the sort order can't be changed inside Roundcube and is given by the locale used. The locale is set to "en_US". In a shell I can change the sort order to what I want with LANG=en_US.UTF-8 and LC_COLLATE=C. Without LC_COLLATE=C I get the same behaviour as Roundcube.
How can I change the collate rules for roundcube e.g. to "C"?
