Repository: vscode
Issue: Strange behavior on html indent line color
Labels: under-discussion,editor-indent-guides

Type: <b>Bug</b>

I am developing a theme pack for vscode. I have noticed that the indent lines have a strange behavior in the html. In other languages they work fine.
I have disabled all extensions and it still happens.

VS Code version: Code 1.81.1 (6c3e3dba23e8fadc360aed75ce363ba185c49794, 2023-08-09T22:22:42.175Z)
OS version: Windows_NT x64 10.0.22621
Modes:

<details>
<summary>System Info</summary>

|Item|Value|
|---|---|
|CPUs|11th Gen Intel(R) Core(TM) i7-11800H @ 2.30GHz (16 x 2304)|
|GPU Status|2d_canvas: enabled<br>canvas_oop_rasterization: disabled_off<br>direct_rendering_display_compositor: disabled_off_ok<br>gpu_compositing: enabled<br>multiple_raster_threads: enabled_on<br>opengl: enabled_on<br>rasterization: enabled<br>raw_draw: disabled_off_ok<br>video_decode: enabled<br>video_encode: enabled<br>vulkan: disabled_off<br>webgl: enabled<br>webgl2: enabled<br>webgpu: enabled|
|Load (avg)|undefined|
|Memory (System)|31.79GB (18.11GB free)|
|Process Argv|--crash-reporter-id ccedd11e-cbe3-4aab-835a-b81d8cc295d7|
|Screen Reader|no|
|VM|0%|
</details><details><summary>Extensions (37)</summary>

Extension|Author (truncated)|Version
---|---|---
codesnap|adp|1.3.4
tsl-problem-matcher|amo|0.6.2
ng-template|Ang|16.1.8
cssrem|cip|3.1.0
vscode-eslint|dba|2.4.2
es7-react-js-snippets|dsz|4.4.3
gitlens|eam|14.2.1
prettier-vscode|esb|10.1.0
todo-tree|Gru|0.0.226
ionic|Ion|1.49.0
Angular2|joh|16.0.1
vscode-peacock|joh|4.2.2
vscode-colorize|kam|0.11.1
git-graph|mhu|1.30.0
isort|ms-|2023.10.1
python|ms-|2023.14.0
vscode-pylance|ms-|2023.8.40
live-server|ms-|0.4.9
vsliveshare|ms-|1.0.5883
vscode-versionlens|pfl|1.5.2
vscode-thunder-client|ran|2.10.5
fabric8-analytics|red|0.3.10
java|red|1.21.0
vscode-xml|red|0.26.1
vscode-yaml|red|1.14.0
partial-diff|ryu|1.4.3
errorlens|use|3.13.0
intellicode-api-usage-examples|Vis|0.2.7
vscodeintellicode|Vis|1.2.30
vscode-java-debug|vsc|0.53.0
vscode-java-dependency|vsc|0.23.1
vscode-java-pack|vsc|0.25.13
vscode-java-test|vsc|0.39.1
vscode-maven|vsc|0.42.0
vscode-icons|vsc|12.5.0
JavaScriptSnippets|xab|1.8.0
markdown-all-in-one|yzh|3.5.1

(1 theme extensions excluded)

</details><details>
<summary>A/B Experiments</summary>

```
vsliv368:30146709
vsreu685:30147344
python383:30185418
vspor879:30202332
vspor708:30202333
vspor363:30204092
vslsvsres303:30308271
vserr242:30382549
pythontb:30283811
vsjup518:30340749
pythonptprofiler:30281270
vshan820:30294714
vstes263:30335439
vscorecescf:30445987
vscod805:30301674
binariesv615:30325510
bridge0708:30335490
bridge0723:30353136
vsaa593cf:30376535
pythonvs932:30410667
vsclangdc:30486549
c4g48928:30535728
dsvsc012:30540252
pynewext54:30695312
azure-dev_surveyone:30548225
vsccc:30803844
3biah626:30602489
89544117:30613380
a9j8j154:30646983
showlangstatbar:30737416
03d35959:30757346
pythonfmttext:30731395
fixshowwlkth:30771522
showindicator:30805244
pythongtdpath:30769146
i26e3531:30792625
gsofa:30804715
pythonnosmt12:30797651
pythonidxptcf:30805731
pythonnoceb:30805159
synctok:30815622
dsvsc013:30795093
dsvsc014:30804076
diffeditorv2:30812749

```

</details>

![image](https://github.com/microsoft/vscode/assets/55595063/1cf6501f-6d8d-4f6b-8da7-20c419b4ce0f)

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