mimeopen -d doesn't work if mimeapps.list contains an [Added Associations] section

[6b6279]

Because mimeopen -d simply appends mimeapps.list, it mistakenly adds the association anew instead of setting it as default. [Added Associations] seems to be only relevant if you have .desktop files that do not have a respective X-Scheme line. Thunderbird, for example, if set as the default application for mail or calendar etc., creates new desktop files and adds associations for the new desktop files. In my case mimeopen -d would simply stop working after letting Thunderbird set itself as the default e-mail application.

I think this problem would arise in all cases where the last section of mimeapps.list isn't [Default Applications].