fix(core): prevents duplicate nodes when @if toggles or @for adds and removes with leave animations
#63048
+85
−2
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In the case that a leave animation is running and someone toggles an
@if, a new node would be inserted. For a brief moment, there may be two of the same nodes visible at once. While this is expected with native CSS, it's not ideal. Instead, we retain a reference to the leaving element and can remove that node when the new node is entering.fixes: #63020