Make PlainTextExtractor match "text/plain" mimetype
Review Request #130013 - Created March 14, 2017 and submitted
After commit 7c7e985a4678fef5f5d0dd8faa9b9cb42e3844b4 (see https://git.reviewboard.kde.org/r/129720/), PlainTextExtractor no longer matches ANY of the text/ mimetypes.
This broke completely Baloo indexing e.g. simple plain text files.
Introduced check however allows to provide "text/plain" as supported mimetype for the extractor and hope that everything containing plain text will be inherited from it.
Baloo indexes plain text files.
Everybody is happy.
Added new test for ExtractorCollection. As for now, it simply checks if collection finds an extractor for known (text/plain) mimetype, and doesn't find anything for a-priory incorrect mimetype.
Also removed unused include (otherwise test should have been linked with KI18N, which is actually not needed).
Revision 2 (+60 -3)