The 'queue' was never used as a queue: it was populated, and then
exchanged into a local copy to be consumed in a loop. This loop used
dequeue(), but of course it could just const-iterate the container and
dump it as the end, since the member variable was already reset at
that point, no-one could tell the difference from the outside.
So, no need for a queue. A vector will do very nicely.
The loop now uses ranged-for and qExchange(), greatly simplifying the
code over the old version.
Add another qExchange() call as a drive-by.
Change-Id: I6147453dc9edfe9500833627b123bb3a31114651
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
8b771e782d