1424657 - After bug 1422201, webextension popup documents no longer accessible

Status: RESOLVED FIXED

(Core :: Disability Access APIs, defect)

Description

[James Teh [:Jamie]]

Spun off bug 1422201 comment 21.

STR (with NVDA): 
1. Try to open grease monkey, or lastpass from the bar of addons.
Expected: a browse mode document with NVDA.
Actual: NVDA just reports unknown.

These popup documents have their own HWND. Therefore, the root accessible of that HWND needs to handle accChild for ids in remote documents therein. Unfortunately, this isn't the "root" accessible, since the root accessible is the root of the main HWND. The root check needs to be tweaked so that it allows for the root accessible for any HWND.

Comment 1

[James Teh [:Jamie]]

Attachment: Bug 1424657: Make IAccessible::accChild handle remote ids for popup windows.

Bug 1422201 changed GetIAccessibleFor so it only handles remote ids when called on the root accessible.
However, this breaks webextension popup documents.
These popups have their own HWND, so the root accessible of that HWND needs to handle accChild for ids in remote documents within that HWND.
Therefore, expand the restriction to cover the root accessible of any HWND, not just the main HWND.

Review commit: https://reviewboard.mozilla.org/r/207052/diff/#index_header
See other reviews: https://reviewboard.mozilla.org/r/207052/

Comment 2

[Eitan Isaacson [:eeejay]]

Comment on attachment 8936327 [details]
Bug 1424657: Make IAccessible::accChild handle remote ids for popup windows.

https://reviewboard.mozilla.org/r/207052/#review213016

This looks great!

Comment 3

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/b27e2fb6c88f
Make IAccessible::accChild handle remote ids for popup windows. r=eeejay

Comment 4

[Cosmin Sabou [:CosminS]]

https://hg.mozilla.org/mozilla-central/rev/b27e2fb6c88f

Comment 5

[James Teh [:Jamie]]

Attachment: Make IAccessible::accChild handle remote ids for popup windows. (Patch for 58.) r=eeejay

Bug 1422201 changed GetIAccessibleFor so it only handles remote ids when called on the root accessible.
However, this breaks webextension popup documents.
These popups have their own HWND, so the root accessible of that HWND needs to handle accChild for ids in remote documents within that HWND.
Therefore, expand the restriction to cover the root accessible of any HWND, not just the main HWND.

MozReview-Commit-ID: 69v4XSeQLcS

Comment 6

[James Teh [:Jamie]]

Verified fixed in Firefox 59.0a1 20171213220121 64 bit.

Comment 7

[James Teh [:Jamie]]

Comment on attachment 8936658 [details] [diff] [review]
Make IAccessible::accChild handle remote ids for popup windows. (Patch for 58.) r=eeejay

Approval Request Comment
[Feature/Bug causing the regression]: Bug 1422201.
[User impact if declined]: Accessibility clients will not be able to access webextension popup documents.
[Is this code covered by automated tests?]: No, because we don't have a mechanism for platform accessibility testing.
[Has the fix been verified in Nightly?]: Yes.
[Needs manual test from QE? If yes, steps to reproduce]: No.
[List of other uplifts needed for the feature/fix]: None.
[Is the change risky?]: Low risk.
[Why is the change risky/not risky?]: Only affects accessibility. Straightforward patch. Easy to verify.
[String changes made/needed]: None.

Comment 8

[Liz Henry (:lizzard)]

Comment on attachment 8936658 [details] [diff] [review]
Make IAccessible::accChild handle remote ids for popup windows. (Patch for 58.) r=eeejay

Fix for recent regression in a11y, let's uplift to beta.

Comment 9

[Sebastian Hengst [:aryx] (needinfo me if it's about an intermittent or backout)]

https://hg.mozilla.org/releases/mozilla-beta/rev/59d404cb212d