This API is undocumented, but by keeping unchanged makes
it easier to use from external projects.
openFile(): Copy the accept/filter list parsing function
from 6.4. It makes sense to implement this behind the
API, so that user code doesn't have to reimplement it.
saveFile(): Slightly more complicated; the new variant which
takes a QByteArray is better since the implementation can
then keep a reference to the data for as long as it needs,
without copying the data. Add the const char * variant to
keep existing code going for now.
Adjust the calling code in widgets.
Pick-to: 6.5
Change-Id: I1899ebffdb90e40429dcb10313ccc5334f20c34f
Reviewed-by: Mikołaj Boc <Mikolaj.Boc@qt.io>
Reviewed-by: Lorn Potter <lorn.potter@gmail.com>
fbf2a318dd