tree c9df875cd12aef0da35307326d0f98b80b0dbcd8
parent 5930498d7fe26d0e0c2525a0323aac2f896dc71d
author Lei Zhang <thestig@chromium.org> 1581531005 +0000
committer Chromium commit bot <commit-bot@chromium.org> 1581531005 +0000

Prevent destruction of CXFA_FFWidget across FWL events.

The current strategy of using ObservedPtr lets the destruction happen,
and then dealing with the destruction. Instead, use RetainPtr on the
CXFA_ContentLayoutItem that owns CXFA_FFWidget to prevent destruction
altogether for the duration of the events.

Bug: chromium:1003501,chromium:1039629
Change-Id: I5d185c752b93904fafb060e13fc18bb5e3ddee52
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/66370
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>