GitLab

Google drive expand/collapse state is not being announced due to
excessive HIDE/SHOW/REORDER events flooding NVDA, and NVDA end up
discarding most events.

For example, if aria-hidden="true" is set on an ancestor node, which
would cause that node many of its descendants to be set to IGNORED
state which triggering too many EVENT_OBJECT_HIDE and causes NVDA
to drop the events. In reality, we only want EVENT_OBJECT_HIDE to be
generated on the ancestor node where aria-hidden="true" is set, so
not to flood and confuse NVDA with excessive events.

This change fixes the above issue by firing EVENT_OBJECT_HIDE on the
root should the entire subtree changes to IGNORED state.

Suppressing excessive SHOW/REORDER events will be addressed in follow up
patches.

AX-RelNotes: NVDA can now announce Google drive "My Drive" expand/
collapse state.

Bug: 1019420
Change-Id: I4fdabd6740630a149c1b22cdb3180d2f75807b10
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2309450
Commit-Queue: Victor Fei <vicfei@microsoft.com>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Reviewed-by: Adam Ettenberger <Adam.Ettenberger@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#795017}