We've resolved the value type in the type propagator. Trying to do it
again in the code generator, after the iterator may have been adjusted,
is quite wrong. If we resolve the list value type on a type that's not
a list (anymore), then we get an invalid type, which subsequently
crashes.
Amends commit a173d50a9e.
Pick-to: 6.9 6.8
Fixes: QTBUG-135288
Change-Id: I1227803ed100c83f8fc11898be0a4d0199d639dd
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>
Ulf Hermann