This patch fixes the breaking of case sensitivity handling. The removal
of QRegExp killed the wrong code paths which leads to inconsistencies
when changing the regular expression throuh methods like
setFilterWildCard or setFilterFixedString. Changing the case sensitivity
also nukes the original options that were set on the regular expression
if it was set through setFilterRegularExpression.
[ChangeLog][QtCore][QSortFilterProxyModel] Case sensitivity as well as
regular expression options handling have been fixed. The original value
is properly kept when using setFilterWildCard and setFilterFixedString.
The regular expression options are now also properly kept when changing
the case senstitivity through setFilterCaseSensitivity.
Fixes: QTBUG-92260
Pick-to: 6.1
Pick-to: 6.0
Change-Id: Ifb4732306f0c7d79ad0b18d3f5437c4523bb40e5
Reviewed-by: Igor Kushnir <igorkuo@gmail.com>
Reviewed-by: Giuseppe D'Angelo <giuseppe.dangelo@kdab.com>
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