Diff decorations are not shown on gutter when working in a directory with NFD Japanese character on Mac

[Marchen]

Type: Bug

When working in a folder having path with NFD Japanese character (utf-8-mac) on Mac (e.g., ~/が), editor does not show diff highlights on gutter for modified lines.
This was not happen when working in a path without NFD Japanese character (e.g., ~/か).

Expected:
Editor shows highlights on modifications on gutter

Actual:
Editor does not show them.

VS Code version: Code 1.97.2 (Universal) (e54c774, 2025-02-12T23:20:35.343Z)
OS version: Darwin x64 24.3.0
Modes:

System Info

Item	Value
CPUs	Intel(R) Core(TM) i9-9980HK CPU @ 2.40GHz (16 x 2400)
GPU Status	2d_canvas: enabled canvas_oop_rasterization: disabled_off 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 video_decode: enabled video_encode: enabled webgl: enabled webgl2: enabled webgpu: enabled webnn: disabled_off
Load (avg)	3, 5, 7
Memory (System)	64.00GB (39.05GB free)
Process Argv	--crash-reporter-id 8c6b232d-a7b8-4a86-9ea4-5f070799633f
Screen Reader	no
VM	0%

Extensions (69)

Extension	Author (truncated)	Version
Bookmarks	ale	13.5.0
rtf	ale	2.8.1
markdown-checkbox	bie	0.4.0
markdown-mermaid	bie	1.27.0
markdown-preview-github-styles	bie	2.1.0
path-intellisense	chr	2.10.0
markdown-table-prettify	dar	3.6.0
vscode-markdownlint	Dav	0.58.2
xml	Dot	2.5.1
vscode-reveal	evi	4.3.3
vscode-diff	fab	2.1.2
vscode-firefox-debug	fir	2.14.1
auto-close-tag	for	0.5.15
copilot	Git	1.271.0
copilot-chat	Git	0.24.1
todo-tree	Gru	0.0.226
r-pack	Iku	0.0.2
plantuml	jeb	2.18.1
copy-markdown-as-html	jer	1.1.0
google-search	kam	0.0.1
bash-ide-vscode	mad	1.43.0
rainbow-csv	mec	3.17.0
git-graph	mhu	1.30.0
zenkaku	mos	0.0.3
vscode-docker	ms-	1.29.4
vscode-language-pack-ja	MS-	1.97.2025021209
debugpy	ms-	2025.0.1
flake8	ms-	2024.0.0
isort	ms-	2023.10.1
python	ms-	2025.0.0
vscode-pylance	ms-	2025.2.1
jupyter	ms-	2025.1.2025013001
jupyter-keymap	ms-	1.1.2
jupyter-renderers	ms-	1.1.0
vscode-jupyter-cell-tags	ms-	0.1.9
vscode-jupyter-slideshow	ms-	0.1.6
remote-containers	ms-	0.397.0
remote-ssh	ms-	0.117.1
remote-ssh-edit	ms-	0.87.0
remote-wsl	ms-	0.88.5
vscode-remote-extensionpack	ms-	0.26.0
hexeditor	ms-	1.11.1
powershell	ms-	2025.0.0
remote-explorer	ms-	0.4.3
remote-server	ms-	1.5.2
resourcemonitor	mut	1.0.7
vscode-json-editor	nic	0.3.0
autodocstring	njp	0.6.1
material-icon-theme	PKi	5.19.0
total-lines	pra	0.0.1
r-debugger	RDe	0.5.5
r	REd	2.8.4
LiveServer	rit	5.7.9
bash-debug	rog	0.3.9
glassit	s-n	0.2.6
p5-vscode	sam	1.2.16
vscode-vba	ser	0.11.2
japanese-word-handler	sgr	1.4.1
trailing-spaces	sha	0.4.1
markdown-preview-enhanced	shd	0.8.15
code-spell-checker	str	4.0.34
ayu	tea	1.0.5
open-in-browser	tec	2.0.0
language-pde	Tob	1.4.6
pdf	tom	1.2.2
vscodeintellicode	Vis	1.3.2
jinja	who	0.0.8
markdown-all-in-one	yzh	3.6.2
cuesheet	zgm	0.4.0

(11 theme extensions excluded)

A/B Experiments

vsliv368cf:30146710
vspor879:30202332
vspor708:30202333
vspor363:30204092
vscod805:30301674
binariesv615:30325510
py29gd2263:31024239
c4g48928:30535728
azure-dev_surveyone:30548225
962ge761:30959799
2e7ec940:31000449
pythontbext0:30879054
cppperfnew:31000557
dwnewjupyter:31046869
nativerepl1:31139838
pythonrstrctxt:31112756
nativeloc2:31192216
iacca1:31171482
5fd0e150:31155592
dwcopilot:31170013
stablechunks:31184530
6074i472:31201624
dwoutputs:31238123
8did9651:31230678
9064b325:31222308
copilot_t_ci:31222730
jda6j935:31233686

[Marchen]

On macOS 15.3.2 (24D81) with VSCode 1.98.2 (Universal), this issue was not already observed.