[w3c/screen-orientation] Refactor fullscreen rejection handling to use WebIDL react pattern (PR #269)

This commit modernizes how the Screen Orientation specification responds to fullscreen request rejections by using the WebIDL 'react' concept instead of the previous flag-based approach.

Changes:
- Replace flag-based 'pending fullscreen request flag unset due to rejection' pattern
- Use WebIDL 'react' pattern with 'pending fullscreen request promise'
- Update reference to use proper 'pending fullscreen request flag' terminology
- Maintain all existing algorithm behavior while modernizing the specification architecture

This enables cleaner, more maintainable specification text that follows modern WebIDL patterns for promise-based APIs. The change complements the fullscreen spec changes in whatwg/fullscreen that add both the exported flag and promise definitions needed for this integration.

Closes #254
Closes #255

The following tasks have been completed:

 * [ ] Modified Web platform tests (link to pull request)

Implementation commitment:

 * [ ] WebKit (https://bugs.webkit.org/enter_bug.cgi)
 * [ ] Chromium (https://bugs.chromium.org/p/chromium/issues/detail?id=)
 * [ ] Gecko (https://bugzilla.mozilla.org/show_bug.cgi?id=)


<!--
    This comment and the below content is programmatically generated.
    You may add a comma-separated list of anchors you'd like a
    direct link to below (e.g. #idl-serializers, #idl-sequence):

    Don't remove this comment or modify anything below this line.
    If you don't want a preview generated for this pull request,
    just replace the whole of this comment's content by "no preview"
    and remove what's below.
-->
***
<a href="https://pr-preview.s3.amazonaws.com/w3c/screen-orientation/pull/269.html" title="Last updated on Oct 17, 2025, 5:18 AM UTC (7c2c201)">Preview</a> | <a href="https://pr-preview.s3.amazonaws.com/w3c/screen-orientation/269/245ed44...7c2c201.html" title="Last updated on Oct 17, 2025, 5:18 AM UTC (7c2c201)">Diff</a>
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/screen-orientation/pull/269

-- Commit Summary --

  * Refactor fullscreen rejection handling to use WebIDL react pattern

-- File Changes --

    M index.html (84)

-- Patch Links --

https://github.com/w3c/screen-orientation/pull/269.patch
https://github.com/w3c/screen-orientation/pull/269.diff

-- 
Reply to this email directly or view it on GitHub:
https://github.com/w3c/screen-orientation/pull/269
You are receiving this because you are subscribed to this thread.

Message ID: <w3c/screen-orientation/pull/269@github.com>