Introduce Vector::appendContainerWithMapping(container, mapFunction) and adopt throughout the code base to reduce further the use of Vector::uncheckedAppend(). This is similar to WTF::map() but can be used on an already constructor vector, potentially containing items already.
Pull request: https://github.com/WebKit/WebKit/pull/18880
Committed 269155@main (a9eaa105ceee): <https://commits.webkit.org/269155@main> Reviewed commits have been landed. Closing PR #18880 and removing active labels.
<rdar://problem/116747088>