1784002 - Painting artifact on <fieldset>'s continuation with inset box-shadow on reftest snapshot mode

Status: NEW

(Core :: Web Painting, defect, P3)

Description

[Ting-Yu Lin [:TYLin] (PDT, UTC-7)]

My patch in bug 793686 disturbs the column balancing height of layout/reftests/box-shadow/611574-2.html and reveal an existing bug that <fieldset> with inset box-shadow can have painting artifact on the fieldset frame's continuation when running reftest in snapshot mode.

Steps to reproduce:

1. Apply the patch Add a fieldset box-shadow reftest that adds fieldset-inset-2.html reftest.
2. Run ./mach reftest --setpref=reftest.use-draw-snapshot=true layout/reftests/box-shadow/fieldset-inset-2.html

Expected result:
The <fieldset> continuation in the second column has no artifact.

Actual result:
The <fieldset> continuation in the second column has green artifact.

Note: The rendering is ok when running ordinary reftest via ./mach reftest layout/reftests/box-shadow/fieldset-inset-2.html

Comment 1

[Ting-Yu Lin [:TYLin] (PDT, UTC-7)]

Attachment: Add a fieldset box-shadow reftest.

Comment 2

[Ting-Yu Lin [:TYLin] (PDT, UTC-7)]

Attachment: reftest snapshot log

Comment 3

[Ting-Yu Lin [:TYLin] (PDT, UTC-7)]

Attachment: screenshot-fieldset-inset-2.png

Here's the screenshot of fieldset-inset-2.html in reftest-analyzer. See the green artifact in the second column.

Comment 4

[BugBot [:suhaib / :marco/ :calixte]]

The severity field is not set for this bug.
:tnikkel, could you have a look please?

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