[Agent] Pending agent edit is dismissed/lost when opening New Window (Ctrl+Shift+N)

[m-tuyishime]

Type: Bug

When an agent proposes a code edit that is displayed as a pending change (ghost text/diff view) in the editor, triggering the "New Window" command (Ctrl+Shift+N) causes the pending edit to completely disappear without applying or rejecting it.

Steps to Reproduce:

Have a Copilot Agent propose a code change to a file (where the change is visible but not yet kept or undone).

While the change is pending (ghost text visible), press Ctrl+Shift+N to open a new empty window.

Result: The focus switches to the new window. When returning to the original window, the pending edit is gone.

Recovery: I have to press Ctrl+Z to bring it back.

Expected Behavior: Opening a new window should not dismiss pending Agent edits in the current window. The state of the editor should be preserved.

Extension version: 0.35.2025121002
VS Code version: Code - Insiders 1.107.0-insider (771b551, 2025-12-09T18:53:37.084Z)
OS version: Windows_NT x64 10.0.19045
Modes:

Logs

Info: copilot token chat_enabled: true, sku: free_educational_quota
Debug: ConversationFeature: onDidAuthenticationChange has token: true
Debug: [context keys] Updating context keys.
Info: [code-referencing] Public code references are enabled.
Trace: CodeSearchChunkSearch.updateRepoStateFromEndpoint(file:///d%3A/tuyis/code/Projects/TradeBot/neuralranch-app). Checking status from endpoint.
Trace: CodeSearchChunkSearch.getRepoIndexStatusFromEndpoint(file:///d%3A/tuyis/code/Projects/TradeBot/neuralranch-app
Trace: CodeSearchChunkSearch.updateRepoStateFromEndpoint(file:///d%3A/tuyis/code/Projects/TradeBot/neuralranch-app.worktrees/worktree-2025-12-11T15-09-30). Checking status from endpoint.
Trace: CodeSearchChunkSearch.getRepoIndexStatusFromEndpoint(file:///d%3A/tuyis/code/Projects/TradeBot/neuralranch-app.worktrees/worktree-2025-12-11T15-09-30
Trace: CodeSearchChunkSearch.updateRepoStateFromEndpoint(file:///d%3A/tuyis/code/Projects/TradeBot/neuralranch-app.worktrees/worktree-2025-12-11T15-10-33). Checking status from endpoint.
Trace: CodeSearchChunkSearch.getRepoIndexStatusFromEndpoint(file:///d%3A/tuyis/code/Projects/TradeBot/neuralranch-app.worktrees/worktree-2025-12-11T15-10-33
Debug: Finished handling auth change event.
Trace: RemoteEmbeddingsComputer::computeEmbeddings success. Elapsed 589.7027999982238
Debug: Related Information: Remote similarly request took 589ms
Debug: Related Information: Successfully Calculated, returning 591ms
Trace: RemoteEmbeddingsComputer::computeEmbeddings success. Elapsed 329.75
Debug: Related Information: Remote similarly request took 330ms
Debug: Related Information: Successfully Calculated, returning 331ms
Trace: [NES][ModelsService][constructor] computing models
Trace: [NES][ModelsService][aggregateModels] created
Trace: [NES][ModelsService][aggregateModels] adding built-in default model: useSlashModels false, fetchedNesModels [object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Trace: [NES][ModelsService][aggregateModels] Adding default model configuration: copilot-nes-oct
Trace: [NES][ModelsService][constructor] computing current model
Trace: [NES][ModelsService][constructor] computing model info
Trace: Fetched auto model for reserve in 231ms.
Info: Fetched model metadata in 291ms 7629f3e7-c564-4f0e-81f8-4762dc536752
Info: ccreq:b7740275.copilotmd | markdown
Debug: Refetch model metadata: Skipped.
Trace: Fetched auto model for reserve in 71ms.
Trace: RemoteEmbeddingsComputer::computeEmbeddings started
Trace: GithubCodeSearchService::getRemoteIndexState(m-tuyishime/neuralranch). Found indexed commit: 1a33867a31ee43dd63ac7cc0c98787ef23ddf4ca.
Trace: CodeSearchChunkSearch.updateRepoStateFromEndpoint(file:///d%3A/tuyis/code/Projects/TradeBot/neuralranch-app.worktrees/worktree-2025-12-11T15-09-30). Updating state to Ready.
Trace: GithubCodeSearchService::getRemoteIndexState(m-tuyishime/neuralranch). Found indexed commit: 1a33867a31ee43dd63ac7cc0c98787ef23ddf4ca.
Trace: CodeSearchChunkSearch.updateRepoStateFromEndpoint(file:///d%3A/tuyis/code/Projects/TradeBot/neuralranch-app). Updating state to Ready.
Trace: GithubCodeSearchService::getRemoteIndexState(m-tuyishime/neuralranch). Found indexed commit: 1a33867a31ee43dd63ac7cc0c98787ef23ddf4ca.
Trace: CodeSearchChunkSearch.updateRepoStateFromEndpoint(file:///d%3A/tuyis/code/Projects/TradeBot/neuralranch-app.worktrees/worktree-2025-12-11T15-10-33). Updating state to Ready.
Trace: RemoteEmbeddingsComputer::computeEmbeddings success. Elapsed 151.0920000001788
Debug: Related Information: Remote similarly request took 151ms
Debug: Related Information: Successfully Calculated, returning 152ms
Trace: ChatStatusWorkspaceIndexingStatus::updateStatusItem(id=180): starting
Trace: CodeSearchChunkSearch::initialize#181 started
Trace: CodeSearchChunkSearch::initialize#181 success. Elapsed 0.03450000286102295
Trace: ChatStatusWorkspaceIndexingStatus::_writeStatusItem()
Trace: RemoteEmbeddingsComputer::computeEmbeddings started
Trace: RemoteEmbeddingsComputer::computeEmbeddings success. Elapsed 134.734800003469
Debug: Related Information: Remote similarly request took 135ms
Debug: Related Information: Successfully Calculated, returning 136ms
Debug: [context keys] Window state change. Needs offline check: false, active: true, focused: false.
Debug: [context keys] Window state change. Needs offline check: false, active: true, focused: true.
Debug: [context keys] Window state change. Needs offline check: false, active: true, focused: false.
Debug: [context keys] Window state change. Needs offline check: false, active: true, focused: true.

Request IDs

1acc6356-27cd-489f-8b19-b68e25c99e3a
e5bd288b-bbef-46e8-9830-948ab134afb0
4705bad0-bfe3-4a83-b13f-1bbba93876f0
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7d7fdbc7-b3ce-4fd2-b3f4-52c09d999142
6fccd292-6c75-4670-8376-65db44ff8c5a
ddf28af9-61a9-4b5d-805d-230a6ecf3e6b
bc6bda48-574b-4309-8189-9b41faa547da
f2d2d578-d5db-4d90-94f2-e3d354140b9f
675aec56-21ed-42a9-a885-13233eae7dd8
12a224da-92b2-4e5d-a595-3da501a171bc

System Info

Item	Value
CPUs	AMD Ryzen 7 2700X Eight-Core Processor (16 x 3700)
GPU Status	2d_canvas: enabled 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)	63.93GB (33.03GB free)
Process Argv
Screen Reader	no
VM	0%

A/B Experiments

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pythonvspyt551cf:31249598
nativeloc1:31118317
dwcopilot:31158714
dwoutputs:31242946
copilot_t_ci:31333650
g012b348:31231168
pythonrdcb7:31268811
pythonpcpt1:31399616
6518g693:31302842
63221493:31336333
envsactivate1:31349248
editstats-enabled:31346256
cloudbuttont:31366566
aihoversummaries_t:31413033
todos-1:31405333
3efgi100_wstrepl:31403338
trigger-command-fix:31379601
auto_model_enabled:31385282
use-responses-api:31390341
6j29d282:31407606
3i15c187:31419923
terminalsuggestenabled:31421703
none:31426257
cp_cls_c_966_ss:31426491
chatvisible:31417128
expandedtokens:31418009
a9239246:31426643
c0683394:31426860
find_all_ref_in_bg_f:31420846
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fa76a614:31426880
38bie571_auto:31429954
rename_disabled:31429650
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anthropic_thinking_t:31427198
cp_jb_t_lixleitest:31428973
406hc587_ask_agent:31428392
copilot-nes-oct-trt:31432609
a3fda397_max_requests_40:31432795