1511757 - `contain: paint` causes lack of render on scrollable grid

Status: RESOLVED DUPLICATE of bug 1494801

(Core :: Layout: Scrolling and Overflow, defect, P3)

Description

[Jacob Pratt]

Attachment: example.html

I believe this should block 1150081.

Please see the attached example. When scrolling, the data is hidden from view until a re-render is forced (which I have been doing by clicking as if to highlight text). This only occurs when both `display: grid` and `contain: paint` are present.

I'm not sure why, but this behavior is not present when the developer console is open.

I have verified this bug on FF63/Linux and FF64/Linux; I presume it affects all platforms when `layout.css.contain.enabled` is enabled.

Comment 1

[Emilio Cobos Álvarez (:emilio)]

I think this is a dupe of bug 1494801, mind confirming it works on Nightly?

Comment 2

[Daniel Holbert [:dholbert]]

Yeah, dupe of bug 1494801.  I verified that it went from broken to fixed in the right range for that bug's patch, with...

mozregression --find-fix --good 2018-11-21 --bad 2018-11-19  -a "https://bugzilla.mozilla.org/attachment.cgi?id=9029237"

So, this'll be fixed in Firefox 65 (going to beta next week, I believe). Thanks for the bug report, in any case!