Matias Niemelä 4ce44eac33 fix(animations): properly track listeners for a removed element (#40712)
Prior to this patch, if an element was removed multiple times (due
to the nature of parent/child elements), the leave listeners may
have been fired for an element that was already removed. This patch
adds a guard within the animations code to prevent this.

PR Close #40712
2021-02-09 10:50:19 -08:00
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