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fix(menu): open animation not working on repeat opens #20382

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crisbeto
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This seems to be a remnant of the old menu animation. Previously when a menu was opened, we had a two step animation: scale and fade in the panel and then fade in the items a little bit later.

When the latest Material design spec update was implemented, the animation was simplified to a fade in and scale only, however some of the metadata doesn't seem to have been cleaned up which is causing an issue where we set an opacity on the items when we close the panel for the first time, but there's nothing resetting it the next time around which ends up causing the entire animation to be skipped.

Fixes #20379.

Note: setting this as a P2, because it's a regression.

This seems to be a remnant of the old menu animation. Previously when a menu was opened, we had a two step animation: scale and fade in the panel and then fade in the items a little bit later.

When the latest Material design spec update was implemented, the animation was simplified to a fade in and scale only, however some of the metadata doesn't seem to have been cleaned up which is causing an issue where we set an `opacity` on the items when we close the panel for the first time, but there's nothing resetting it the next time around which ends up causing the entire animation to be skipped.

Fixes angular#20379.
@crisbeto crisbeto added P2 The issue is important to a large percentage of users, with a workaround target: patch This PR is targeted for the next patch release labels Aug 21, 2020
@googlebot googlebot added the cla: yes PR author has agreed to Google's Contributor License Agreement label Aug 21, 2020
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LGTM

@jelbourn jelbourn added the action: merge The PR is ready for merge by the caretaker label Sep 1, 2020
@andrewseguin andrewseguin merged commit ea628c9 into angular:master Sep 9, 2020
andrewseguin pushed a commit that referenced this pull request Sep 9, 2020
This seems to be a remnant of the old menu animation. Previously when a menu was opened, we had a two step animation: scale and fade in the panel and then fade in the items a little bit later.

When the latest Material design spec update was implemented, the animation was simplified to a fade in and scale only, however some of the metadata doesn't seem to have been cleaned up which is causing an issue where we set an `opacity` on the items when we close the panel for the first time, but there's nothing resetting it the next time around which ends up causing the entire animation to be skipped.

Fixes #20379.

(cherry picked from commit ea628c9)
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bug(Menu): menu open animation lost after first click
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