Git - All lines in files with 400 lines and more are shown as modified in gutter while they are not

Type: Bug

When I have files with around 400 lines of text or more in git repository, gutter starts to show all lines are changed, when they are actually not. For files with 300 lines and less everything is works as expected.

Does this issue occur when all extensions are disabled?

• Yes (reproduced with code --disable-extensions)
• No

Steps to Reproduce

1. Clone the minimal repro repository (https://github.com/mlesin/vscode_scm_bug.git) or create a new Git repo with committed file containing ≥ 400 lines.
2. Ensure git status is clean.
3. Open the file in VS Code editor.
4. Observe the gutter decorations.

Expected Behaviour

The gutter should show no modified lines when the file content is identical to the index/HEAD.

Actual Behaviour

The Git Local Changes (Working Tree) layer paints every line as modified, even though git status is clean.

Screenshots

File with 400 lines, note all lines shown as changed:

File with 300 lines in the same repo, everything is fine:

Additional Information

• Issue reproduces both locally and inside Dev Containers / Remote‑SSH.
• Setting git config --global core.autocrlf input and keeping .gitattributes (* text eol=lf) does not resolve the problem.
• Setting diffEditor.diffAlgorithm to legacy does not resolve the problem
• I see this behavior only in on Linux (Ubuntu 24.04), tried on different machines.
• On Windows and MacOS everything works as expected.

---

Thank you for your hard work! If more info or a full repo dump is required, feel free to ask.

VS Code version: Code 1.101.2 (2901c5ac6db8a986a5666c3af51ff804d05af0d4, 2025-06-24T20:27:15.391Z) OS version: Linux x64 6.8.0-62-generic Modes:

Item	Value
CPUs	12th Gen Intel(R) Core(TM) i9-12900KF (24 x 4900)
GPU Status	2d_canvas: enabledcanvas_oop_rasterization: enabled_ondirect_rendering_display_compositor: disabled_off_okgpu_compositing: enabledmultiple_raster_threads: enabled_onopengl: enabled_onrasterization: enabledraw_draw: disabled_off_okskia_graphite: disabled_offvideo_decode: enabledvideo_encode: disabled_softwarevulkan: disabled_offwebgl: enabledwebgl2: enabledwebgpu: disabled_offwebnn: disabled_off
Load (avg)	1, 1, 1
Memory (System)	125.62GB (108.34GB free)
Process Argv	--crash-reporter-id e359f71a-98d0-4d0d-a7c7-fb6c9ec2768d
Screen Reader	no
VM	0%
DESKTOP_SESSION	plasma
XDG_CURRENT_DESKTOP	KDE
XDG_SESSION_DESKTOP	KDE
XDG_SESSION_TYPE	x11

Extension	Author (truncated)	Version
vscode-base64	ada	0.1.0
auto-add-brackets	ali	0.12.2
vscode-zipfs	arc	3.0.0
arkdark	ark	6.6.0
toml	be5	0.6.0
vscode-hex-pm-intellisense	ben	0.5.0
markdown-checkbox	bie	0.4.0
markdown-emoji	bie	0.3.1
markdown-footnotes	bie	0.1.1
markdown-mermaid	bie	1.28.0
markdown-preview-github-styles	bie	2.2.0
markdown-yaml-preamble	bie	0.1.0
mermaid-markdown-syntax-highlighting	bpr	1.7.4
vscode-tailwindcss	bra	0.14.23
vscode-casbin	Cas	0.0.2
npm-intellisense	chr	1.4.5
path-intellisense	chr	2.10.0
vscode-css-modules	cli	0.5.4
gitignore	cod	0.10.0
doxdocgen	csc	1.4.0
meld-diff	dan	1.5.1
vscode-eslint	dba	3.0.10
docker	doc	0.11.0
githistory	don	0.6.20
xml	Dot	2.5.1
sort-lines-by-selection	ear	1.2.0
vscode-html-css	ecm	2.0.13
EditorConfig	Edi	0.17.4
prettier-vscode	esb	11.0.0
dependi	fil	0.7.15
auto-rename-tag	for	0.1.10
shell-format	fox	7.2.5
copilot	Git	1.338.0
copilot-chat	Git	0.28.5
cmake-integration-vscode	go2	0.7.1
vscode-graphql	Gra	0.13.2
vscode-graphql-syntax	Gra	1.3.8
todo-tree	Gru	0.0.226
haskell	has	2.6.0
vscode-test-explorer	hbe	2.22.1
rest-client	hum	0.25.1
output-colorizer	IBM	0.1.2
path-autocomplete	ion	1.25.0
vscode-edit-csv	jan	0.11.4
plantuml	jeb	2.18.1
better-cpp-syntax	jef	1.27.1
svg	joc	1.5.4
cmake-language-support-vscode	jos	0.0.9
language-haskell	jus	3.6.0
vscode-python-test-adapter	lit	0.8.2
git-graph	mhu	1.30.0
import-sorter	mik	3.3.1
dotenv	mik	1.0.1
ecdc	mit	1.8.0
thrift-syntax-support	mrk	0.0.12
vscode-duplicate	mrm	1.2.1
language-gettext	mro	0.5.0
vscode-containers	ms-	2.0.3
vscode-docker	ms-	2.0.0
vscode-dotnet-runtime	ms-	2.3.6
vscode-pgsql	ms-	1.6.0
black-formatter	ms-	2025.2.0
debugpy	ms-	2025.8.0
isort	ms-	2025.0.0
python	ms-	2025.8.0
vscode-pylance	ms-	2025.6.2
remote-containers	ms-	0.417.0
remote-ssh	ms-	0.121.2025063015
remote-ssh-edit	ms-	0.87.0
remote-wsl	ms-	0.99.0
vscode-remote-extensionpack	ms-	0.26.0
cmake-tools	ms-	1.20.53
cpptools	ms-	1.26.3
cpptools-extension-pack	ms-	1.3.1
remote-explorer	ms-	0.6.2025063009
remote-server	ms-	1.5.2
test-adapter-converter	ms-	0.2.1
vscode-speech	ms-	0.16.0
vscode-speech-language-pack-ru-ru	ms-	0.5.0
vscode-websearchforcopilot	ms-	0.1.2
windows-ai-studio	ms-	0.16.0
back-n-forth	nic	3.1.1
rust-macro-expand	Odi	1.0.0
vscode-commons	red	0.0.6
vscode-xml	red	0.29.0
vscode-yaml	red	1.18.0
bash-debug	rog	0.3.9
rust-analyzer	rus	0.3.2519
online-help	sal	0.2.8
jinjahtml	sam	0.20.0
semanticdiff	sem	0.10.0
bash-beautify	sha	0.1.1
markdown-preview-enhanced	shd	0.8.18
vscode-wl	shi	1.7.3
vite	Sim	1.0.4
just	ske	2.0.0
vscode-taskexplorer	spm	2.13.2
external-formatters	Ste	0.2.0
vscode-rust-test-adapter	Swe	0.11.0
sass-indented	syl	1.8.33
hex-lens	szT	0.0.2
even-better-toml	tam	0.21.2
vscode-markdown-paste-image	tel	1.4.3
shellcheck	tim	0.37.7
graphviz-interactive-preview	tin	0.3.5
es6-string-html	Tob	2.17.0
vscode-json-stable-stringify	Tra	1.3.0
vscode-mdx	uni	1.8.15
errorlens	use	3.26.0
vscode-lldb	vad	1.11.5
intellicode-api-usage-examples	Vis	0.2.9
vscodeintellicode	Vis	1.3.2
vscode-mermaid-preview	vst	2.1.1
volar	Vue	3.0.1
gitblame	wad	11.1.4
salt-lint	war	0.1.0
saltstack-extension-pack	war	0.0.2
vscode-todo-highlight	way	1.0.5
vscode-nginx	wil	0.7.2
vscode-mdx-preview	xyc	0.3.3
markdown-all-in-one	yzh	3.6.3

(2 theme extensions excluded)

vsliv368cf:30146710
vspor879:30202332
vspor708:30202333
vspor363:30204092
vscod805:30301674
binariesv615:30325510
c4g48928:30535728
azure-dev_surveyone:30548225
2i9eh265:30646982
962ge761:30959799
h48ei257:31000450
pythontbext0:30879054
cppperfnew:31000557
dwnewjupyter:31046869
pythonrstrctxt:31112756
nativeloc1:31192215
5fd0e150:31155592
dwcopilot:31170013
6074i472:31201624
dwoutputs:31242946
customenabled:31248079
hdaa2157:31222309
copilot_t_ci:31333650
e5gg6876:31282496
pythoneinst12:31285622
bgtreat:31268568
4gafe986:31271826
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pythonpulldiagcf:31335740
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pythonrdcb7cf:31303019
usemplatestapi:31297334
0aa6g176:31307128
7bj51361:31289155
747dc170:31275177
aj953862:31281341
generatesymbolt:31295002
convertfstringf:31295003
pylancequickfixf:31329273
9d2cg352:31339597
jhi8h917:31338107
i851h500:31338111
usemarketplace:31336439
nesew2to5:31336538
agentclaude:31335815
nes-diff-11:31337487
6abeh943:31336334
yijiwantestdri0626-c:31336931
hi92a955:31337023