a QSortFilterProxyModel will trigger a new sort whenever needed, so
custom code is not needed
we might have someone that would use the standard property and loose teh
side effects of setting the source model via thet non standard property
this makes it more complicated to read as one might wonder why a custom
property was needed
deletes a bunch of code not really needed
Signed-off-by: Matthieu Gallien <matthieu.gallien@nextcloud.com>
ran
run-clang-tidy-14.py -header-filter='.*' -checks='-*,cppcoreguidelines-pro-type-static-cast-downcast' -fix
this can prevent casting to a type that is unrelated to the real type
and later cause a crash because you go into undefined behavior domain
Signed-off-by: Matthieu Gallien <matthieu.gallien@nextcloud.com>