Copilot changes diff do not honor word wrap

Type: Bug

Visual Studio Code editor allows word-wrap, which automatically breaks visually long lines so they fit in the visible panel. While not typical for code, this is usual for prose text, such as markdown or latex files.

When using Copilot agent for editing the file, the changes show the typical diff view with red/green showing the changes. However, while the green section honors the word wrap, the red section do not, and extends horizontally as if the word wrap is disabled.

The expected behavior is that both red and green sections should honor word wrap, if it is enabled.

VS Code version: Code 1.127.0 (4fe60c8b1cdac1c4c174f2fb180d0d758272d713, 2026-06-30T10:52:33+02:00)
OS version: Linux x64 6.17.0-40-generic
Modes:

System Info

|Item|Value|
|---|---|
|CPUs|AMD Ryzen 7 5800X 8-Core Processor (16 x 3731)|
|GPU Status|2d_canvas: enabled
GPU0: VENDOR= 0x10de [Google Inc. (NVIDIA Corporation)], DEVICE=0x2b85 [ANGLE (NVIDIA Corporation, NVIDIA GeForce RTX 5090/PCIe/SSE2, OpenGL ES 3.2 NVIDIA 595.71.05)], DRIVER_VENDOR=NVIDIA, DRIVER_VERSION=595.71.05 *ACTIVE*
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: disabled_software
vulkan: enabled_on
webgl: enabled
webgpu: enabled
webgpu_on_vk_via_gl_interop: enabled
webnn: disabled_off|
|Load (avg)|1, 1, 1|
|Memory (System)|60.70GB (44.01GB free)|
|Process Argv|--crash-reporter-id 89612602-b655-46ff-aed1-a827085acbae|
|Screen Reader|no|
|VM|0%|
|DESKTOP_SESSION|ubuntu|
|XDG_CURRENT_DESKTOP|ubuntu:GNOME|
|XDG_SESSION_DESKTOP|ubuntu|
|XDG_SESSION_TYPE|wayland|
Extensions (31)

Name|Identifier|Author|Version
---|---|---|---
Go|golang.go|golang|0.54.0
LaTeX Workshop|james-yu.latex-workshop|James-Yu|10.16.1
Lean 4|leanprover.lean4|leanprover|0.0.237
Rainbow CSV|mechatroner.rainbow-csv|mechatroner|3.24.1
GitHub Copilot for Azure|ms-azuretools.vscode-azure-github-copilot|ms-azuretools|1.0.209
Azure MCP Server|ms-azuretools.vscode-azure-mcp-server|ms-azuretools|2.0.45
Azure Resources|ms-azuretools.vscode-azureresourcegroups|ms-azuretools|0.12.7
Container Tools|ms-azuretools.vscode-containers|ms-azuretools|2.4.5
Docker|ms-azuretools.vscode-docker|ms-azuretools|2.0.0
.NET Install Tool|ms-dotnettools.vscode-dotnet-runtime|ms-dotnettools|3.1.0
Python Debugger|ms-python.debugpy|ms-python|2026.6.0
isort|ms-python.isort|ms-python|2026.6.0
Python|ms-python.python|ms-python|2026.4.0
Pylance|ms-python.vscode-pylance|ms-python|2026.2.1
Python Environments|ms-python.vscode-python-envs|ms-python|1.36.0
Jupyter|ms-toolsai.jupyter|ms-toolsai|2025.9.1
Jupyter Keymap|ms-toolsai.jupyter-keymap|ms-toolsai|1.1.2
Jupyter Notebook Renderers|ms-toolsai.jupyter-renderers|ms-toolsai|1.3.0
Jupyter Cell Tags|ms-toolsai.vscode-jupyter-cell-tags|ms-toolsai|0.1.9
Jupyter Slide Show|ms-toolsai.vscode-jupyter-slideshow|ms-toolsai|0.1.6
Dev Containers|ms-vscode-remote.remote-containers|ms-vscode-remote|0.463.0
CMake Tools|ms-vscode.cmake-tools|ms-vscode|1.23.52
C/C++ DevTools|ms-vscode.cpp-devtools|ms-vscode|0.5.13
C/C++|ms-vscode.cpptools|ms-vscode|1.32.2
Foundry Toolkit for VS Code|ms-windows-ai-studio.windows-ai-studio|ms-windows-ai-studio|1.6.2
Prolog|rebornix.prolog|rebornix|0.0.4
Even Better TOML|tamasfe.even-better-toml|tamasfe|0.21.2
vscode-pdf|tomoki1207.pdf|tomoki1207|1.2.2
Python PyPI Assistant|twixes.pypi-assistant|twixes|3.0.1
CMake|twxs.cmake|twxs|0.0.17
DeepSeek V4 for Copilot Chat|vizards.deepseek-v4-for-copilot|Vizards|0.6.2

A/B Experiments

```
vsliv368cf:30146710
pythonvspyt551cf:31249601
binariesv615:30325510
nativeloc1:31344060
dwcopilot:31170013
dwoutputs:31242946
copilot_t_ci:31333650
e5gg6876:31282496
pythonrdcb7:31342333
6518g693:31463988
aj953862:31281341
6abeh943:31336334
envsactivate1:31538736
gh487529:31544284
cloudbuttont:31379625
3efgi100_wstrepl:31403338
ddidtcf:31399634
ec5jj548:31422691
cp_cls_t_966_ss:31526232
4je02754:31466945
8hhj4413:31478653
ge8j1254_inline_auto_hint_haiku:31490510
38bie571_auto:31478678
cp_cls_c_1081:31454833
conptydll_true:31498968
ia-use-proxy-models-svc:31452481
e9c30283:31461165
test_treatment2:31471001
c9b86496:31447327
capi_axe_098a3278:31544981
idci7584:31464702
e3e4d672:31494082
ei9d7968:31496641
nes-extended-on:31455476
chat:31457767
8hig5102:31480529
89g7j272:31518289
7e187181:31503455
i2gc6536:31499202
52612955:31516516
ghj88844:31499326
ec1eg703:31520046
ddid_c:31478207
hmra_i5g22:31518061
ie3bb177:31543534
7df3h592:31512476
cp_cls_t_1082:31535311
logging_enabled_new:31498466
j0d79568:31499440
jb_cp_cls_t_632:31543129
748c7209:31512887
32d76977:31512328
ha629193:31508444
cdk-lw-on:31524445
f9bf7985:31543584
2cfga817_c:31522397
a1ije391_t:31540920
g4a0e106:31529594
41836166:31537719
prpt_ctrl:31518467
jbcp_cls_pctr_t:31531130
61138546:31518536
cp_intellij_c_nes:31533503
d7b18187:31526828
nes-curr-leftover-1500:31538366
h561g132:31533256
sessions_5:31532894
h7dd7680:31543284
ihg5j128:31534457
9gg7f176:31542112
sandbox-ui-on-2:31543161

```