Closed Bug 1297572 Opened 3 years ago Closed 3 years ago

AllChildrenIterator misses native anonymous content from the root scroll frame


(Core :: DOM: Core & HTML, defect)

Not set



Tracking Status
firefox51 --- fixed


(Reporter: bholley, Assigned: bholley)




(2 files)

It detects native anonymous children by QueryFrame-ing the primary frame to nsINativeAnonymousContentCreator. This generally works, but the root scroll frame is not the primary frame of the root element, and so we miss this case. This is problematic for stylo, since we restyle using the DOM rather than the frame tree, so we need our DOM iterator to handle corner cases like this.

I have a patch which I'll run through try.
Comment on attachment 8784472 [details] [diff] [review]
Handle the root scroll frame in AllChildrenIterator. v1

Review of attachment 8784472 [details] [diff] [review]:

r=me with that fixed.

::: dom/base/ChildIterator.cpp
@@ +423,5 @@
> +        nsIPresShell* presShell = mOriginalContent->OwnerDoc()->GetShell();
> +        nsIFrame* scrollFrame = presShell ? presShell->GetRootScrollFrame() : nullptr;
> +        if (scrollFrame) {
> +          AppendAnonymousChildrenFromFrame(scrollFrame);
> +        }

Don't we need to do this all in GetPreviousChild too?
Attachment #8784472 - Flags: review?(cam) → review+
boxes. r=heycam

The layout inspector ends up traversing into the root scroll frame in the next patch. If we don't
fix this, we erroneously enter this code here:

in this test:

Attachment #8785115 - Flags: review+
Pushed by
Prevent HasPseudoElementData from erroneously tracking anonymous boxes. r=heycam
Handle the root scroll frame in AllChildrenIterator. r=heycam
FWIW I just pushed a try run to check that we never have non-pseudo style inheriting from anon box style, except for the viewport scroll case, and I didn't get any failures.
Thanks! When I get around to it, I'll see if I can push a patch to try to make the root scroll NAC inherit null instead of the anon boxes.
Closed: 3 years ago
Resolution: --- → FIXED
Target Milestone: --- → mozilla51
Component: DOM → DOM: Core & HTML
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