Ruby: Update beforeChild when redirecting renderer insertion to a child.
In addChild(), beforeChild needs to be a descendant of the parent
that's attempting to insert a renderer.
Therefore, when inserting a something, and we decide to drill further
into the tree to find a suitable parent for the new renderer, we need
to update beforeChild as we go, to make sure that it remains a
descendant of the parent that's trying to do the insertion.
In this case it was the list item code that attempted to insert a list
item marker beside a RenderRubyRun (beforeChild). However,
RenderRubyAsBlock::addChild() doesn't want that, so it tells its
RenderRubyRun child to insert it instead. RenderRubyRun will in turn
do the same thing, redirect insertion to its RenderRubyBase child,
which finally is a suitable parent for the marker (and pretty much
anything else). Doing this without updating beforeChild as we go,
caused problems, since beforeChild suddenly was a parent of the
inserting parent.
BUG=395522
Review URL: https://codereview.chromium.org/563763002
git-svn-id: svn://svn.chromium.org/blink/trunk@183761 bbb929c8-8fbe-4397-9dbb-9b2b20218538
4 files changed
