In Qt < 5.10 (and also sometimes on Windows), we get extra spaces or newlines
when moving to the end of the document. However, this only happens *sometimes*,
and manual testing confirms that with the current workaround, we actually lose
the last char in the selection.
I'm not sure what's happening there, but instead of making things worse with
the workaround, let's just be a bit less strict with the checking there and
accept both variants... This seems like some Chromium bug we can't do much
about.
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