Collapse.js: Tweak active children selector, to search only .collapsing
& .collapse.show
#35692
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Tweak active children selector, to search only
.collapsing
as for ui reasons, during show/hide, we toggle.collapse
class tooExplanation: Seems like that in order to achieve smooth transitions during toggling, we toggle
.collapse
class too. So the activeChildren selection fails to include transitioning instances, between quick switchingcontradicts #25161
closes #35685