[Gecko Bug 1725293] checkValidity() on <select required> returns true when <option value=> is moved in the dom #30148
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The new check should be still fast, since accessing selected index is trivial and Item() call is just accessing the element from an
nsTArray.
Differential Revision: https://phabricator.services.mozilla.com/D123371
bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1725293
gecko-commit: 5d85665d2784d62c2a4397521c1b17d4211834a4
gecko-reviewers: edgar