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Auto-detect language mode fails with LICENSE file without extension #312572

@jonathandung

Description

@jonathandung

Type: Bug

See vscode-markdownlint#432. Basically, the plain-text MIT license at my project root is being detected as markdown, and inapplicable diagnostics emerge.

VS Code version: Code 1.111.0 (ce099c1, 2026-03-06T23:06:10Z)
OS version: Windows_NT x64 10.0.26200
Modes:

System Info
Item Value
CPUs 11th Gen Intel(R) Core(TM) i5-1135G7 @ 2.40GHz (8 x 2419)
GPU Status 2d_canvas: enabled
GPU0: VENDOR= 0x8086, DEVICE=0x9a49 [Intel(R) Iris(R) Xe Graphics], DRIVER_VENDOR=Intel, DRIVER_VERSION=32.0.101.6737 ACTIVE
GPU1: VENDOR= 0x1414, DEVICE=0x008c [Microsoft Basic Render Driver], DRIVER_VERSION=10.0.26100.8246
Machine model name:
Machine model version:
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) undefined
Memory (System) 7.85GB (1.27GB free)
Process Argv --crash-reporter-id 9453c078-702b-4b0c-be82-802577994672
Screen Reader no
VM 0%
Extensions (16)
Extension Author (truncated) Version
toml be5 0.6.0
ruff cha 2026.40.0
vscode-markdownlint Dav 0.61.2
githistory don 0.6.20
EditorConfig Edi 0.18.2
copilot-chat Git 0.39.2
vscode-github-actions git 0.31.5
vscode-json5 mrm 1.0.0
vscode-containers ms- 2.4.2
debugpy ms- 2026.5.11141010
python ms- 2026.5.2026032701
vscode-pylance ms- 2026.2.101
vscode-python-envs ms- 1.29.2026042401
remote-containers ms- 0.456.0
makefile-tools ms- 0.13.26
vscode-yaml red 1.23.2026042408
A/B Experiments
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binariesv615:30325510
nativeloc1:31344060
dwcopilot:31170013
dwoutputs:31242946
copilot_t_ci:31333650
e5gg6876:31282496
pythonrdcb7:31342333
6518g693:31463988
aj953862:31281341
6abeh943:31336334
envsdeactivate2:31464701
cloudbuttont:31379625
42190218_ostrepl:31403339
ec5jj548:31422691
cp_cls_t_966_ss:31454198
4je02754:31466945
8hhj4413:31478653
ge8j1254_inline_auto_hint_haiku:31491949
38bie571_auto:31429954
cp_cls_t_1081:31454832
conptydll_true:31498968
ia-use-proxy-models-svc:31452481
e9c30283:31461165
test_treatment2:31471001
idci7584:31464702
e3e4d672:31494082
ei9d7968:31496641
534a6447:31496642
nes-extended-on:31455476
chat:31457767
8hig5102:31480529
dfc2j404:31500885
cpptoolson-v2:31475363
i2gc6536:31499202
ghj88844:31499326
ec1eg703:31491645
ddid_c:31478207
getcmakediagnosticson:31489824
cp_cls_c_1082:31491634
j0d79568:31499440
748c7209:31497895

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