[Development] Qt6 source changes

Ulf Hermann ulf.hermann at qt.io
Fri Nov 2 09:20:39 CET 2018

> Depends on usage.
> See e.g. 551efd91990e07902e5324f720cf5585865c323d
>     QmlProfiler: Use QList for QmlRange container when loading .qtd
>     As we are using this as a queue, with many calls to takeFirst(), a
>     QVector is prohibitively expensive here.

I should have used QQueue there, and that will hopefully still be a 
linked(-ish) list in Qt6. Or it might become a ring buffer, but please 
not a plain vector.

If we don't want to keep QQueue, I will still have the option to use an 
equivalent std container there (+/- implicit sharing).


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