Add timezone filtering by region too
Review Request #123740 - Created May 12, 2015 and submitted
Adds a simple QSortFilterProxyModel on top of TimeZonesModel and reimplements filterAcceptsRow using QStringMatcher (supposedly faster according to qtdocs).
Sidenote: Originally I did try to implement this using the "filterCallback" in PlasmaCore.SortFilterModel, but this worked very very wonkily. Basically on "z" it would match correctly, on "zu" the list is suddenly empty. Sometimes. No matter what I tried, I couldn't get that to work and work reliably (it also requires changes in plasma-framework to call the invalidate() after each char is typed in and a "get(int row)" function in the TimeZoneModel). After spending manymany hours on this, I just went for this simple 50 lines addition instead. And it just works (tm).
Timezones are now correctly filtered by both city and region.