Atom Dark Layout Issue on MacOS Sierra GM

[lonetis]

Prerequisites

• Can you reproduce the problem in safe mode?
• Did you check the debugging guide?
• Are you running the latest version of Atom?
• Did you check the FAQs on Discuss?
• Are you reporting to the correct repository?
• Did you perform a cursory search to see if your bug or enhancement is already reported?

Description

The Atom Editor uses a darker grey background color in the edited area of the editor and in the untouched area a normal grey color. This issue occurs in

• Atom Dark
• One Dark
• Solarized Dark

### Steps to Reproduce 1. Open Atom 1.10.2 on MacOS Sierra Golden Master Release 2. Use a dark layout

Expected behavior: single backgound color grey

Actual behavior: 2 different background colours in one editor (dark and light grey)

Versions

Atom : 1.10.2
Electron: 0.37.8
Chrome : 49.0.2623.75
Node : 5.10.0
OS: MacOS Sierra Golden Master 64bit

[Greenek]

The same problem with atom-material-ui. Glitches are pretty random and sometimes after window resize problem disappears for a while.

Atom: 1.11.0-beta5
Electron: 0.37.8
Chrome: 49.0.2623.75
Node: 5.10.0
OS: macOS Sierra GM

[simurai]

Just from a gut feeling, this looks like some GPU rendering issue. Like if the textures that get sent to the GPU are missing in some places. Also because the width seems to be 256px and I think that's how large GPU tiles are? /cc @as-cii

Electron (+ Chromium) just got updated, so that might fix this issue in Atom 1.12.

[Greenek]

I made a little investigation and I found that problem affects probably all electron applications with dark elements, but only at monitors with custom color profiles (for example with non-native gamma value). This issue didn't occur before, so I guess it can be related with Wide Color support introduced in Sierra.

Edit: It's probably Chromium bug - #633805

[thomasjo]

This is indeed caused by https://bugs.chromium.org/p/chromium/issues/detail?id=633805. Good find @Greenek!

@atom/feedback I marked this as electron, but technically speaking this is caused by rendering bug in Chromium. Do we leave this open here until it gets resolved upstream and ultimately makes it way through to us?

[Greenek]

BTW bug looks to be fixed in Chromium 54.0.2840.27 (beta) and higher. For now, the only solution for affected users is changing monitor's color profile.

[iolsen]

Do we leave this open here until it gets resolved upstream and ultimately makes it way through to us?

Yeah let's leave it open until we get the Chromium fix or find another workaround.

[Greenek]

I found the solution. Problem disappears when Chromium has GPU rasterization enabled, so running Atom (or any other Electron app) with --force-gpu-rasterization or --enable-gpu-rasterization does the trick.

Related: #3787

[pedantic79]

Another solution is to run atom with --disable-gpu.