There is an off by one in the implementation of count(): a match
must be attempted even at the very end of the string, because
a 0-length match can happen there. While at it, improve
the documentation on the counter-intuitive behavior of count(),
which doesn't merely count how many times a regexp matches
into a string using ordinary global matching.
[ChangeLog][QtCore][QString] Fixed a corner case when using
QString::count(QRegularExpression), causing an empty in the
last position not to be accounted for in the returned result.
Change-Id: I064497839a96979abfbac2d0a96546ce160bbc46
Pick-to: 5.15 6.0
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>