Hi,

Bug Description:

When using the OutputChannelManager the OutputChannelSeverity in the appendLine method does not work as expected, it does not color the Warning and Error as expected.
I have inspected the output line in the dev tools, and saw that the span over the message line has this class="mtk1 theia-output-warning", the

Please confirm that this problem is VSCodium-specific

• This bug doesn't happen if I use Microsoft's Visual Studio Code. It only happens in VSCodium.

Please confirm that the issue/resolution isn't already documented

• [ X ] I checked the Docs page and my issue is not mentioned there.

To Reproduce
Steps to reproduc

1. Select theme with thick strip in line number block.
2. Save and restart. Open some file. Нou see that the first characters of the lines are hidden under stripe.
3. Open another file. All display properly.
4. If you see carefully that the whole block with line numbers in the first case is shifted to the left.
   First file
   

Since becoming maintainer of this project, and making some security updates, we have not been able to get the electron build working. This is why there has not been a release in a while.

This is no small undertaking, but very very important!

Is your task related to a problem? Please describe.

When a Che-Theia plug-in is running a separate sidecar and it requests a resource from a local file system with vscode.workspace.fs API, Che-Theia tries to look for a requested resource in its own container. But such a call should be forwarded into the plug-in's sidecar.

Describe the solution you'd like

We need to adapt `vscode.wor

cc rust-lang/rls#1112
cc microsoft/language-server-protocol#376

This causes problems with displaying correct diagnostic span and code suggestion spans (here).

Whenever triggering a Find References, the sort order is changed from whatever you set (i.e. Path) to Text.

VS bug #785358