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composed needs to be set to true in synthetic events (similar to bubbles) so the event propagates in a similar way as to when it's dispatched by the browser. Docs.

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(This needs a rebase, to land after #82939)

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This pull request is not suitable for automatic merging in its current state.

• The status or check suite Google testing has failed. Please fix the issues identified (or deflake) before re-applying this label.