1527837 - [Ubuntu] Stuttering scrolling in maximized window/full screen

Status: RESOLVED FIXED

(Core :: Widget: Gtk, defect)

Description

[Anca Soncutean, Desktop QA]

[Affected versions]:

• 66.0b7
• 67.0a1 |(2019-02-13)

[Affected platforms]:

• Ubuntu 18.04 x64

[Steps to reproduce]:

1. Navigate to any website (eg. http://techcrunch.com/2016/04/05/will-an-apple-a-day-keep-webrtc-away/)
2. Scroll the page
3. Maximize the browser or enter in fullscreen mode (F11)
4. Scroll the page again

[Expected result]:

• The scrolling action is smooth and stable.

[Actual result]:

• Obvious lag can be observed, the scrolling action is stuttering, sometimes the scroll gets stuck for some seconds.

[Regression range]:

• Last good revision: 1c227ac918eb1ab0b702d4424603faeb836f2b1c
• First bad revision: 64d38928ff5a59fb8214a0ee2472dccd6f16705d
• Pushlog:
  https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=1c227ac918eb1ab0b702d4424603faeb836f2b1c&tochange=64d38928ff5a59fb8214a0ee2472dccd6f16705d
• Potential regressor: Bug 1521012

[Additional Notes]:

• Not reproducible on other Ubuntu version I’ve tested (16.04 x32) or other platform (Win 10 x64 and macOS 10.13).
• Setting layout.css.scroll-anchoring.enabled to false does not make any difference.

Comment 1

[Tim Spurway [:tspurway]]

Martin is this one in the right component?

Comment 2

[Martin Stránský [:stransky] (ni? me)]

Sure, I'll look at it. I suspect this comes from window manager to client side decoration switch.

Comment 3

[Martin Stránský [:stransky] (ni? me)]

Can you please retest with latest nightly? Thanks.

Comment 4

[Anca Soncutean, Desktop QA]

This issue is no longer reproducible on Nightly 67.0a1(2019-02-25).

Comment 5

[Andrew Overholt [:overholt]]

(In reply to Anca Soncutean [:Anca], Desktop Release QA from comment #4)

This issue is no longer reproducible on Nightly 67.0a1(2019-02-25).

Great! Martin, is there something that should be uplifted to 66?

Comment 6

[Martin Stránský [:stransky] (ni? me)]

(In reply to Andrew Overholt [:overholt] from comment #5)

(In reply to Anca Soncutean [:Anca], Desktop Release QA from comment #4)

This issue is no longer reproducible on Nightly 67.0a1(2019-02-25).

Great! Martin, is there something that should be uplifted to 66?

Yes, it's fixed by Bug 1530625. I'm watching Bug 1530625 for possible regressions and prepare a patch for beta next week if everything goes well.

Comment 7

[Julien Cristau [:jcristau]]

Looks like that's on beta now.