Linux app icons look blurry on 100% DPI

[srirambv]

Description

Linux app icons look blurry on 100% DPI

Steps to Reproduce

1. Install all brave channels
2. pin them as favourites
3. Unpin them as its too bad to look at

Actual result:

Brave icons on favourites bar

Brave icons in apps listing

Brave icons vs stock icons

Expected result:

Same as stock app icons not blurry

Reproduces how often:

Easy

Device display info

cc: @brave/uplift-approvers @bradleyrichter @rossmoody to decide priority of the issue

[rossmoody]

I've done a bunch of research on this and I'm a little stumped. A few things I can say for certain:

1. Linux is getting served the correct icons at the correct sizes which is 128px. brave/brave-core@980fda8#diff-ca3b8b8f7388a32c28d344375ceca455R12
2. The icons aren't pixelated at 128px. Scaling them down should not result in the pixelation we're seeing here.
3. The icons can't be served larger than 128px.
4. When I pull the icons that are getting served to Linux out of the build and look at them, they don't look like what's posted here. None of the available icons that can be served could produce that result from what I can tell. This leads me to think it's a cache issue or the system is searching for an icon it can't find so it's using some artifact in memory.

This is also sorta interesting because it seems like it's not having the issue with Release but it is with the builds. @simonhong might be worth pinging for a quick look on this as I saw he setup a lot of the early Linux build stuff.

A few things thing I came across when researching that might be worth pursuing would be below. I think otherwise, we should find another person with Gnome 3 Ubuntu who can recreate this so we know it's not isolated.

https://gitlab.gnome.org/GNOME/mutter/issues/135
https://askubuntu.com/questions/722708/how-do-i-refresh-the-icon-cache

[fmarier]

I'm running GNOME 3 at 100% DPI and I don't these blurry icons in the sidebar:

or in the applications panel: