1425745 - layers-free: Drag the scrollbar, no response on some about: pages

Status: VERIFIED FIXED

(Core :: Graphics: WebRender, defect, P1)

Description

[YF (Yang)]

STR:
1. Set gfx.webrender.enabled to true and restart Firefox.
2. Open about:support, about:profiles or about:networking#dns, use the mouse to drag the vertical scroll bar.


Actual results:
1. No response, the scroll bar is pressed but not moved, and the page not scroll.
2. On about:plugins and about:telemetry#environment-data-tab_system pages is works fine.


Build:
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:59.0) Gecko/20100101 Firefox/59.0 ID:20171217100047

Comment 1

[Darkspirit]

about:support

mozregression --good 2017-10-02 --bad 2017-12-17 --pref layers.acceleration.force-enabled:true gfx.webrender.enabled:true gfx.webrendest.enabled:true gfx.webrender.layers-free:true gfx.webrender.blob-images:true image.mem.shared:true layout.display-list.retain:false
> 10:55.98 INFO: Last good revision: e61f5fc8ed7330a6e4ca5f9efebee86769e3a3af
> 10:55.98 INFO: First bad revision: 691af1e600e06fcee33478a39d03c43a24c5d2e8
> 10:55.98 INFO: Pushlog:
> https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=e61f5fc8ed7330a6e4ca5f9efebee86769e3a3af&tochange=691af1e600e06fcee33478a39d03c43a24c5d2e

(2017-07-27)
> 691af1e600e0	Kartikaya Gupta — Bug 1384181 - Add utility dump functions for debugging. r=jrmuizel
> 3a1dfb72b225	Kartikaya Gupta — Bug 1384181 - Build WebRenderLayerScrollData instances for remote layer trees. r=jrmuizel
> b298cd21c0f1	Kartikaya Gupta — Bug 1384181 - Ensure that the WebRenderScrollData has a single root layer node. r=jrmuizel
> b12122c2c75d	Kartikaya Gupta — Bug 1384181 - Reorganize the WebRenderScrollData code to work with layers-free transactions. r=jrmuizel

Comment 2

[Darkspirit]

correction:
--good 2017-07-02

Comment 3

[Kartikaya Gupta (email:[e-mail])]

I can repro on windows, but not macOS.

Comment 4

[Darkspirit]

But I can repro on Linux.

Comment 5

[Kartikaya Gupta (email:[e-mail])]

gfx.webrender.hit-test enabled makes this problem go away, so marking this dependent on that bug.

Comment 8

[Kartikaya Gupta (email:[e-mail])]

This should be fixed by bug 1421380.

Comment 9

[Darkspirit]

Debian Testing (KDE, Radeon RX480)

Since when does the scrollbar on about:support work again?

mozregression --find-fix --bad 2018-01-12 --good 2018-01-31 --pref gfx.webrender.all:true startup.homepage_welcome_url:"about:support"
> 8:54.33 INFO: First good revision: 5fc179e245d51289f1f7bcaba0c29189d3336fbf
> 8:54.33 INFO: Last bad revision: ca489678fdedaff1c660dddf7ee62c966787b59a
> 8:54.33 INFO: Pushlog:
> https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=ca489678fdedaff1c660dddf7ee62c966787b59a&tochange=5fc179e245d51289f1f7bcaba0c29189d3336fbf

Fixed by:
> 5fc179e245d5	Kartikaya Gupta — Bug 1421380 - Enable gfx.webrender.hit-test by default. r=jrmuizel
> c182e492a2e7	Kartikaya Gupta — Bug 1421380 - Don't do a composite of WR rendered frames unless a composite is requested. r=nical

Comment 10

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

Set release status flags based on info from the regressing bug 1384181