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When grabbing focus or setting the sequential focus navigation starting
point for AtkText nodes, we should use the character offset to set it
on the proper child node. This ensures that tab navigation works as
expected after calling AtkText APIs on a parent node.

Bug: 955349
Change-Id: Idf8677f7d4fb205fee46905c80fb1bf5bc9baf40
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1599616
Commit-Queue: Martin Robinson <mrobinson@igalia.com>
Reviewed-by: Joanmarie Diggs <jdiggs@igalia.com>
Cr-Commit-Position: refs/heads/master@{#658516}