1464821 - in selected text, of a paragraph with multiple lines, white space between lines blink when scrolled

Status: RESOLVED DUPLICATE of bug 1451439

(Core :: Graphics: WebRender, defect, P3)

Description

[Mayank Bansal]

Attachment: Non-WR.mp4

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:62.0) Gecko/20100101 Firefox/62.0
Build ID: 20180527220122

Steps to reproduce:

1. Enable WR.
2. Go to https://bugzilla.mozilla.org/show_bug.cgi?id=1434130#c13
3. Select the middle paragraph.
4. SCroll with touchpad slowly


Actual results:

If you observe carefully, the white space between the lines (white space between the selected blue text) fills and then whites out.
This creates a blinking/shimmer effect when selected paragraph of text is scrolled


Expected results:

less so.

Comment 1

[Mayank Bansal]

Attachment: WR.mp4

Comment 2

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

I can repro this on Windows (but not on macOS).

Comment 3

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

Presumably this is a jibble-jabble issue inside WR since it happens during async scrolling when we're not sending new display lists. /cc nical

Comment 4

[Darkspirit]

Linux:
bad: 2018-02-15, 2018-03-15, 2018-04-15, 2018-05-15

mozregression --good 2017-09-15 --bad 2018-01-15 --pref layers.acceleration.force-enabled:true gfx.webrender.enabled:true gfx.webrender.blob-images:true image.mem.shared:true startup.homepage_welcome_url:'https://bugzilla.mozilla.org/show_bug.cgi?id=1434130#c13'
15:49.18 INFO: Pushlog:
https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=6f83e51a6d78b812e9dac2ae3c3638af1b0c86c1&tochange=4997d8582287d5a7c52ab75af65da363ce1d81df

> bug 1392723 - Turn on text layers by default

with webrendest:
mozregression --good 2017-08-15 --bad 2017-09-15 --pref layers.acceleration.force-enabled:true gfx.webrender.enabled:true gfx.webrendest.enabled:true gfx.webrender.blob-images:true image.mem.shared:true startup.homepage_welcome_url:'https://bugzilla.mozilla.org/show_bug.cgi?id=1434130#c13'
13:39.69 INFO: Pushlog:
https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=834821ca057915b9458ad7c76a130da4c2b59782&tochange=564959d26e8db243ded3d57380842620e60e89e7

> 564959d26e8d	Alexis Beingessner — Bug 1357545 - handle text-shadows/decorations with webrender (layers-free) r=jrmuizel

Comment 5

[Darkspirit]

I could confirm the first range on Windows. The other range had GPU process crashs/fallbacks.

Comment 6

[Mayank Bansal]

I have a Wintel+iGFX system.

Comment 7

[Mayank Bansal]

Attachment: aboutsupport.txt

Comment 8

[Jeff Muizelaar [:jrmuizel]]

Yep. I can reproduce on Windows. Tentatively blocking release for now.

Comment 9

[Darkspirit]

Verified fixed by bug 1451439.

Comment 11

[Mayank Bansal]

yes this is fixed. and this was a big pet peeve of mine that made using WR visually jarring.
Thanks!