1408780 - Bright white fade-out effect on tabs with long titles

Status: RESOLVED FIXED

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

Description

[Asif Youssuff]

Attachment: tab-fade-wr-vs-default.png

User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:58.0) Gecko/20100101 Firefox/58.0
Build ID: 20171015100127

Steps to reproduce:

Enable:

turn on gfx.webrender.enabled
turn on gfx.webrendest.enabled
turn on gfx.webrender.layers-free
turn on gfx.webrender.blob-images
turn on layers.acceleration.force-enabled

1. Navigate to any page where the title is longer than what will fit into a tab. cnn.com works
2. Look at tab


Actual results:

The fade-out effect near the close icon for the active tab is a bright white color.


Expected results:

The fade-out effect should disappear into the tab background color, not be brighter than the tab background. 

See screenshot comparing webrender vs. standard nightly. 

 7:46.83 INFO: Narrowed inbound regression window from [f0137607, 72d52134] (4 builds) to [e2a919fa, 72d52134] (2 builds) (~1 steps left)
 7:46.83 INFO: No more inbound revisions, bisection finished.
 7:46.83 INFO: Last good revision: e2a919fabb6aefe155764cf091888539c4693c24
 7:46.83 INFO: First bad revision: 72d52134e37521561e0a00b0cfcb8027a41811b2
 7:46.83 INFO: Pushlog:
https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=e2a919fabb6aefe155764cf091888539c4693c24&tochange=72d52134e37521561e0a00b0cfcb8027a41811b2

Comment 1

[Markus Stange [:mstange]]

Upstream issue in the webrender repo: https://github.com/servo/webrender/issues/1765#issuecomment-336576620

Comment 2

[Markus Stange [:mstange]]

This has been fixed in the webrender repo. The next webrender update will fix it.

Comment 3

[Markus Stange [:mstange]]

Fixed by bug 1408461.