fix(snack-bar): announcing same message twice to screen readers #14504
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Currently we have
role="alert"
on the snack bar which will cause screen readers to announce the message automatically. On top of it, we also use theLiveAnnouncer
to announce the same message, if the consumer hasn't set one. These changes clear theannouncementMessage
if it's the same as the main message.Note: this is a resubmit of #13298.
Fixes #14825.