Tobias Deiminger authored Sep 09, 2018 and Albert Astals Cid committed Sep 19, 2018

QT_STRICT_ITERATORS prevents conversion from non-const iterator to const iterator.

It helps detecting situations where we waste resources due to
needless detach from implicitely shared container data (i.e. deep copy).

If anyone should run into problems, they can disable strict iterators
using a global cache variable:

$ cmake DENABLE_QT_STRICT_ITERATORS=OFF [...]