D8195: Improve render plugin selection

[Volker Krause]

vkrause added inline comments.

INLINE COMMENTS

> knauss wrote in messagepartrendererfactory.cpp:157
> return true, because, if this is empty there is no mimetype set.

That would require all plugins (and all internal renderers) to actually specify a mimetype. That is not currently the case, so we treat that as a renderer that can handle any mimetype, and thus also with the lowest priority, as its most generic. For those having a 1:1 mapping to custom part types that is perfectly fine, no need for a mimetype there anyway.

REPOSITORY
  R94 PIM: Message Library

REVISION DETAIL
  https://phabricator.kde.org/D8195

To: vkrause, knauss
Cc: #kde_pim, dvasin, winterz, vkrause, mlaurent, knauss, dvratil
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