Internal bug: https://b.corp.google.com/u/0/issues/113674363

Comment#0 :
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Additional History: b/37641670, b/37641965

This will happen on any Android device that support Accessibility Acitons with any recent version of WebView.

STEPS TO REPRODUCE:
1. Try to use AccessibilityNodeInfo.ACTION_SET_TEXT in the Gmail Compose message body.
2. Observe that the node does not support ACTION_SET_TEXT

As an editable text field, I would expect the ability to set the text within the field. The field appears to accept single character input from the IME, but not being able to set the text is limiting in terms of A11y features. Things like undo or smart text replacement become difficult since the text cannot be set.
                                                                                                  The set of actions it appears to support are: [ACTION_CLEAR_FOCUS, ACTION_CLICK, ACTION_ACCESSIBILITY_FOCUS, ACTION_NEXT_AT_MOVEMENT_GRANULARITY, ACTION_PREVIOUS_AT_MOVEMENT_GRANULARITY, ACTION_NEXT_HTML_ELEMENT, ACTION_PREVIOUS_HTML_ELEMENT, ACTION_COPY, ACTION_PASTE, ACTION_CUT, ACTION_SET_SELECTION, ACTION_UNKNOWN]

Previous fixes made Switch Access kind of work since input still comes from the IME, but lots of Switch Access's advanced text manipulation fails. Voice Access doesn't type via the IME which makes composing an email with it not possible through Gmail.

Comment#1:
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This should be the case for Chrome on Android too. WebView doesn't seem to do anything different, as far as I can see.

This issue is raised as a feature request, hence marking as Untriaged for further inputs from dev team.

Thanks!