Add overloads to the find() methods in QPlainTextEdit and QTextEdit
that find the next occurrence matching the passed regular expression.
These are convenience methods that eliminate the need to use the
document() method and the need to handle the QTextCursor return value.
[ChangeLog][QtWidgets][QPlainTextEdit] Added find method overload using QRegExp
[ChangeLog][QtWidgets][QTextEdit] Added find method overload using QRegExp
Change-Id: Ia6139b771e3ae4ca02e4b8ea7fde19e5dc71b9d8
Reviewed-by: Marc Mutz <marc.mutz@kdab.com>