1705826 - Apply the overscroll effect to fixed content (non-WebRender)

Status: VERIFIED FIXED

(Core :: Panning and Zooming, defect)

Description

[Botond Ballo [:botond]]

Splitting out the non-WebRender fix for bug 1704503 into this bug. Will use bug 1704503 to track the WR fix.

Comment 1

[Botond Ballo [:botond]]

Attachment: Bug 1705826 - Apply the overscroll transform to content fixed to the root (non-WebRender). r=tnikkel

This is accomplished by the overscroll transform being part of the visual
component of the root content APZC's async transform.

We were already doing this right in AsyncPanZoomController (as of bug
1699868), but the call sites in AsyncCompositionManager needed to be
updated.

Comment 2

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/3b729f0fb230
Apply the overscroll transform to content fixed to the root (non-WebRender). r=tnikkel

Comment 3

[Narcis Beleuzu [:NarcisB]]

https://hg.mozilla.org/mozilla-central/rev/3b729f0fb230

Comment 4

[Cosmin Sabou [:CosminS]]

Backed out for reftest failures on skip-ink-multiline-position.html.

Push with failures: https://treeherder.mozilla.org/jobs?repo=autoland&selectedTaskRun=OFhCs0c_Q5Ku8XRBYSn85w.0&resultStatus=success%2Ctestfailed%2Cbusted%2Cexception%2Cretry%2Cusercancel&searchStr=windows%2C7%2Creftest&tochange=4fa9c71b33b2f7924758b48160941d340e93eb7e&fromchange=c7075d42e472fab8a262d740ef89c046a9871362

Failure log: https://treeherder.mozilla.org/logviewer?job_id=336970263&repo=autoland

Backout link: https://hg.mozilla.org/integration/autoland/rev/86e3dbe085844a610593cf0aae5af2de701f30e0

Comment 5

[Sebastian Hengst [:aryx] (needinfo me if it's about an intermittent or backout)]

These failures only hit Windows 7 opt.

Comment 6

[Botond Ballo [:botond]]

That is... very strange (but based on some retriggers the link between the failure and this patch does seem to be valid).

Comment 7

[Sebastian Hengst [:aryx] (needinfo me if it's about an intermittent or backout)]

Backout merged: https://hg.mozilla.org/mozilla-central/rev/3b729f0fb230

Comment 8

[Botond Ballo [:botond]]

After some more Try pushes, I've narrowed down the test failure to being caused by the mere addition of a new reftest (and I've even removed all pref flips and reftest attributes to make sure there's nothing unusual about the reftest I'm adding that could be causing problems), which causes a re-chunking of reftests on the affected platform.

• Here is a Try push of a recent autoland tip. Note the affected test, layout/reftests/text-decoration/skip-ink-multiline-position.html, is in the R1 chunk of Windows 7 opt, and it's passing consistently.
• Here is a Try push of the same autoland revision + my added (very boring) reftest. Note that skip-ink-multiline-position.html has now moved to the R2 chunk of Windows 7 opt, and now it's failing consistently.

Jonathan, do you have a suggestion for what to do about this? Should I disable the offending test (skip-ink-multiline-position.html) for Windows 7 opt?

Comment 9

[Jonathan Kew (:jfkthame)]

I've seen that test fail similarly before - it's vulnerable to the Win7 issue with DirectWrite sometimes failing to load the font resource, and anything that perturbs the details of the test run, timing- or chunking-wise, can affect how likely it is to happen. (See bug 1396260, which is closed but was never really fixed, just somewhat mitigated.)

I think disabling the test on Win7 would be fine; there's nothing Win7-specific about it (the behavior being tested is platform-independent), and the graphics/font subsystem on Win7 is just too flaky to be worth worrying about.

Comment 10

[Botond Ballo [:botond]]

Attachment: Bug 1705826 - Disable skip-ink-multiline-position.html on Windows 7. r=jfkthame

Comment 11

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/8990a3df0feb
Disable skip-ink-multiline-position.html on Windows 7. r=jfkthame
https://hg.mozilla.org/integration/autoland/rev/a46a3719b9aa
Apply the overscroll transform to content fixed to the root (non-WebRender). r=tnikkel

Comment 12

[Natalia Csoregi [:nataliaCs]]

https://hg.mozilla.org/mozilla-central/rev/8990a3df0feb
https://hg.mozilla.org/mozilla-central/rev/a46a3719b9aa

Comment 13

[Botond Ballo [:botond]]

Comment on attachment 9216506 [details]
Bug 1705826 - Apply the overscroll transform to content fixed to the root (non-WebRender). r=tnikkel

Beta/Release Uplift Approval Request

• User impact if declined: Overscroll effect will not apply to fixed content

Required for MR1 / Proton

• Is this code covered by automated tests?: Yes
• Has the fix been verified in Nightly?: Yes
• Needs manual test from QE?: No
• If yes, steps to reproduce:
• List of other uplifts needed: None
• Risk to taking this patch: Low
• Why is the change risky/not risky? (and alternatives if risky): Patch is small and only affects rendering when the page is overscrolled
• String changes made/needed:

Comment 14

[Pascal Chevrel:pascalc]

Comment on attachment 9216506 [details]
Bug 1705826 - Apply the overscroll transform to content fixed to the root (non-WebRender). r=tnikkel

Approved for 89 beta 3, thanks.

Comment 15

[Pascal Chevrel:pascalc]

Comment on attachment 9217222 [details]
Bug 1705826 - Disable skip-ink-multiline-position.html on Windows 7. r=jfkthame

Approved for 89 beta 3, thanks.

Comment 16

[Pascal Chevrel:pascalc]

https://hg.mozilla.org/releases/mozilla-beta/rev/750eea7e865f

Comment 17

[Andrei Purice]

Verified fixed for Beta 98.0b3 (20210422190146) and Nightly 90.0a1 (2021-04-22 (20210422213157) on MacOS 11.2.3 and Mac mini M1 11.0.1 in regards to applying the overscroll transform to content fixed to the root (non-WebRender).