[w3c/selection-api] Fixes https://github.com/w3c/selection-api/issues/170. (PR #172)

Add a boolean flag "has scheduled selectionchange event" to selection, and check it before queuing a task to fire a `selectionchange` event.


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<a href="https://pr-preview.s3.amazonaws.com/w3c/selection-api/pull/172.html" title="Last updated on Mar 15, 2024, 12:46 AM UTC (985c48d)">Preview</a> | <a href="https://pr-preview.s3.amazonaws.com/w3c/selection-api/172/c44e3e1...985c48d.html" title="Last updated on Mar 15, 2024, 12:46 AM UTC (985c48d)">Diff</a>
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/selection-api/pull/172

-- Commit Summary --

  * Fixes https://github.com/w3c/selection-api/issues/170.

-- File Changes --

    M index.html (37)

-- Patch Links --

https://github.com/w3c/selection-api/pull/172.patch
https://github.com/w3c/selection-api/pull/172.diff

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