Wrong syntax highlighting for triple-quoted F-strings

[myknbani]

Type: Bug

Behaviour

It is confused by standalone triple quotes as beginning a docstring comment.

Steps to reproduce:

1. Open a new tab with this snippet:

def foo():
    """
    Sample function that does nothing.
    """

    return f"""
        This is a {foo.__name__} multi-line string that is returned by 
        the function.
    """

def bar():
    """
    Wrong highlighting ends on the opening triple quotes of the docstring 
    of this function.
    """

    return ""

Diagnostic data

Output for Python in the Output panel (View→Output, change the drop-down the upper-right of the Output panel to Python)

2026-02-16 08:19:45.318 [info] Native locator: Refresh started
2026-02-16 08:19:45.318 [info] Skipping ActivatedEnv Detection:  process.env.VSCODE_CLI !== '1'
2026-02-16 08:19:45.318 [info] > conda info --json
2026-02-16 08:19:45.380 [info] > pyenv which python
2026-02-16 08:19:45.380 [info] cwd: .
2026-02-16 08:19:46.310 [info] Python interpreter path: ./.venv/bin/python
2026-02-16 08:19:46.396 [info] Native locator: Refresh finished in 1592 ms
2026-02-16 08:19:47.862 [info] Starting Pylance language server.

Extension version: 2026.0.0
VS Code version: Code 1.109.3 (b6a47e94e326b5c209d118cf0f994d6065585705, 2026-02-12T17:54:48.470Z)
OS version: Darwin arm64 25.2.0
Modes:

• Python version (& distribution if applicable, e.g. Anaconda): 3.13.7
• Type of virtual environment used (e.g. conda, venv, virtualenv, etc.): Venv
• Value of the python.languageServer setting: Default

User Settings

languageServer: "Pylance"

Installed Extensions

Extension Name	Extension Id	Version
append-comma	vco	0.0.1
azure-dev	ms-	0.10.0
better-cpp-syntax	jef	1.27.1
catppuccin-vsc	Cat	3.18.1
catppuccin-vsc-icons	Cat	1.26.0
catppuccin-vsc-pack	cat	1.0.2
cmake	twx	0.0.17
cmake-tools	ms-	1.22.27
code-runner	for	0.12.2
codesnap	adp	1.3.4
copilot-chat	Git	0.37.6
cpptools	ms-	1.30.5
cpptools-extension-pack	ms-	1.3.1
cpptools-themes	ms-	2.0.0
csdevkit	ms-	2.10.3
csharp	ms-	2.120.3
cucumberautocomplete	ale	3.1.0
custom-ui-style	sub	0.6.7
dart-code	Dar	3.128.0
debugpy	ms-	2025.18.0
docker	doc	0.18.0
docomment	k--	1.0.1
docs-view	bie	0.1.0
doxdocgen	csc	1.4.0
durablefunctionsmonitor	Dur	6.7.3
EditorConfig	Edi	0.18.1
editorconfiggenerator	nep	0.2.1
elixir-ls	Jak	0.30.0
elm-ls-vscode	elm	2.8.0
emojisense	bie	0.10.0
es6-string-html	Tob	2.17.0
even-better-toml	tam	0.21.2
flutter	Dar	3.128.0
git-project-manager	fel	1.8.2
githistory	don	0.6.20
github-markdown-preview	bie	0.3.0
gitignore	cod	0.10.0
gitlens	eam	17.10.0
go	gol	0.52.2
isort	ms-	2025.0.0
javascript-ejs-support	Dig	1.3.3
jinjahtml	sam	0.20.0
js-debug	ms-	1.105.0
js-debug-companion	ms-	1.1.3
jsdoc-markdown-highlighting	bie	0.0.1
json-minifier	Ren	0.0.2
jupyter	ms-	2025.9.1
jupyter-keymap	ms-	1.1.2
jupyter-renderers	ms-	1.3.0
language-gettext	mro	0.5.0
markdown-all-in-one	yzh	3.6.3
markdown-checkbox	bie	0.4.0
markdown-emoji	bie	0.3.1
markdown-footnotes	bie	0.1.1
markdown-image-size	bie	0.0.4
markdown-mermaid	bie	1.32.0
markdown-preview-enhanced	shd	0.8.20
markdown-preview-github-styles	bie	2.2.0
markdown-shiki	bie	0.1.1
markdown-yaml-preamble	bie	0.1.0
material-icon-theme	PKi	5.31.0
mdc	Nux	0.5.0
mermaid-markdown-syntax-highlighting	bpr	1.7.6
metals	sca	1.63.0
microsoft-testing	ms-	0.2.0
migrate-java-to-azure	vsc	1.12.1
ng-template	Ang	21.1.1
noctis	liv	10.43.3
pascalcase-camelcase-to-snakecase-converter	mar	0.2.2
pgformatter	bra	1.33.0
plantuml	jeb	2.18.1
postcss	css	1.0.9
prettier-vscode	esb	12.3.0
protobuf-vsc	DrB	1.6.0
pubspec-assist	jer	2.3.2
pulumi-lsp-client	pul	0.2.3
pulumi-vscode-copilot	pul	0.3.4
pulumi-vscode-tools	pul	0.4.0
python	ms-	2026.0.0
rainbow-csv	mec	3.24.1
remote-containers	ms-	0.442.0
remote-explorer	ms-	0.5.0
remote-ssh	ms-	0.122.0
remote-ssh-edit	ms-	0.87.0
rest-client	hum	0.25.1
ruff	cha	2026.36.0
scala	sca	0.5.9
shader	sle	1.1.5
significant-other	jas	0.3.0
slidev	ant	52.12.0
terraform	has	2.37.7
test-adapter-converter	ms-	0.2.1
todo-tree	Gru	0.0.226
trailing-semicolon	nau	1.0.2
vscode-as-git-mergetool	zaw	0.14.0
vscode-azure-github-copilot	ms-	1.0.153
vscode-azure-mcp-server	ms-	1.0.1
vscode-azureappservice	ms-	0.26.4
vscode-azurecontainerapps	ms-	0.10.0
vscode-azurefunctions	ms-	1.20.3
vscode-azureresourcegroups	ms-	0.12.0
vscode-azurestaticwebapps	ms-	0.13.2
vscode-azurestorage	ms-	0.17.1
vscode-azurevirtualmachines	ms-	0.6.10
vscode-bicep	ms-	0.40.2
vscode-containers	ms-	2.4.1
vscode-cosmosdb	ms-	0.30.2
vscode-docker	ms-	2.0.0
vscode-dotnet-runtime	ms-	3.0.0
vscode-eslint	dba	3.0.20
vscode-github-actions	git	0.31.0
vscode-graphql	Gra	0.13.2
vscode-graphql-execution	Gra	0.3.2
vscode-graphql-syntax	Gra	1.3.8
vscode-java-upgrade	vsc	1.12.1
vscode-js-profile-table	ms-	1.0.10
vscode-json5	mrm	1.0.0
vscode-jupyter-cell-tags	ms-	0.1.9
vscode-jupyter-slideshow	ms-	0.1.6
vscode-markdown-everywhere	zha	0.0.17
vscode-monorepo-workspace	fol	1.3.1
vscode-node-azure-pack	ms-	1.8.0
vscode-peacock	joh	4.2.2
vscode-pgsql	ms-	1.16.0
vscode-pylance	ms-	2025.10.4
vscode-python-envs	ms-	1.16.0
vscode-sort-json	ric	1.20.0
vscode-sql-template-literal	for	0.1.0
vscode-tailwindcss	bra	0.14.29
vscode-test-explorer	hbe	2.22.1
vsfire	tob	1.4.1
vshaxe	nad	2.34.2

System Info

Item	Value
CPUs	Apple M4 (10 x 2400)
GPU Status	2d_canvas: enabled GPU0: VENDOR= 0x106b [Google Inc. (Apple)], DEVICE=0x0000 [ANGLE (Apple, ANGLE Metal Renderer: Apple M4, Version 26.2 (Build 25C56))], DRIVER_VENDOR=Apple, DRIVER_VERSION=26.2 ACTIVE Machine model name: Mac Machine model version: 16.13 direct_rendering_display_compositor: disabled_off_ok gpu_compositing: enabled multiple_raster_threads: enabled_on opengl: enabled_on rasterization: enabled raw_draw: disabled_off_ok skia_graphite: disabled_off trees_in_viz: disabled_off video_decode: enabled video_encode: enabled webgl: enabled webgl2: enabled webgpu: enabled webnn: disabled_off
Load (avg)	2, 2, 2
Memory (System)	24.00GB (0.07GB free)
Process Argv	--crash-reporter-id 012f170b-434c-4e5e-95e0-9d04fe31a27c
Screen Reader	no
VM	0%

A/B Experiments

vsliv368:30146709
binariesv615:30325510
nativeloc1:31344060
dwcopilot:31170013
dwoutputs:31242946
copilot_t_ci:31333650
e5gg6876:31282496
pythonrdcb7:31342333
6518g693:31436602
aj953862:31281341
6abeh943:31336334
cloudbuttont:31379625
3efgi100_wstrepl:31403338
839jf696:31457053
use-responses-api:31390855
je187915:31401257
ec5jj548:31422691
cmp-ext-treat:31426748
cp_cls_c_966_ss:31454199
ge8j1254_inline_auto_hint_haiku:31431912
nes-autoexp-10:31446583
a5gib710:31434435
38bie571_auto:31461585
rename_enabled:31436409
7a04d226_do_not_restore_last_panel_session:31438103
anthropic_thinking_c:31457102
722j7530_gpt_5_2_codex:31458091
h0hdh950:31428394
preserve_tokens:31444547
cp_cls_c_1081:31454833
copilot-nes-oct-trt:31432596
ia-use-proxy-models-svc:31452481
nes-slash-models-on:31441832
nes-set-to-on:31441941
a43f0574a:31442826
e9c30283:31461165
c0ci8992_validated:31449878
nes-fast-additive:31462666
control_6dc23131:31461115
9c05b404_max_request_50:31461828
edit_mode_hidden:31461530
864ei723_large_tool_results_to_disk:31460878
reg-2ge67640:31455970
nes-extended-on:31455476
chat:31457767
ah:31460422

[myknbani]

Closing this for now. Doesn't seem to manifest with code --disable-extensions.

EDIT: yes it's caused by https://marketplace.visualstudio.com/items?itemName=zhaouv.vscode-markdown-everywhere