Tree Guide Indents not showing in latest Insiders (1.41)

[DeltaRazero]

Tree guide indents will not show up at all in the latest insider build, regardless of always enabled or show on hover.

Version: 1.41.0-insider
Commit: bef029a9d21904c0085c4e8ef1335d9c33a28fa4
Date: 2019-12-09T15:42:51.762Z
Electron: 6.1.5
Chrome: 76.0.3809.146
Node.js: 12.4.0
V8: 7.6.303.31-electron.0
OS: Windows_NT x64 6.1.7601

Does this issue occur when all extensions are disabled?: Yes

[IllusionMH]

Looks like elements are there, but have border-left: 1px solid transparent;

[gjsjohnmurray]

/confirm this is a regression in 1.41.

@sbatten should this be tagged as a candidate for fixing before release?

[isidorn]

I am investigating when this broke exactly..
@DeltaRazero if you know that it worked with some previous insiders do tell me.

[isidorn]

@IllusionMH You are correct that the transparent color is the issue here, if I remove the transparent they get nicely rendered. However we always had that code. I believe this indent guides can be styled, and that styling got broke. Investigating more

This looks fishy here. Never do I get a style with an treeIndentGuidesStroke

fyi @misolori

[isidorn]

The following commit broke it 75a778d
However we can not just revert the commit since that breaks tree selection. So that commit screwed up how the default styler is being set to the tree. Investingating..

[isidorn]

Ok found a fix, creating a PR.