739b849487
It was possible for <input> and <textarea> to incorrectly report the IsReadOnly property as "true" to UIA, particularly when empty. There is no text leaf in empty text inputs, so our TextLeafPoint would point to the text field itself. Code that retrieves attributes for UIA didn't handle this case, which caused AT issues, such as Narrator failing to switch out of scan mode automatically. This revision fixes the issue by properly checking for text fields when figuring out whether a TextLeafPoint's Accessible is read-only. It also adds a test to verify the same. Differential Revision: https://phabricator.services.mozilla.com/D237644
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