Emilio Cobos Álvarez 4ad501e86f Bug 1666497 - Don't flush layout from popuppositioned events. r=mconley,Gijs,smaug
We don't need to flush before dispatching the event because we know that
if the values we cared about changed, then we'd get another event.

Differential Revision: https://phabricator.services.mozilla.com/D92444
2020-10-06 16:28:41 +00:00
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