Fix text/uri-list transformation in tree view drag for remote environments

[Copilot]

Dragging files from tree views (e.g., references search panel) in remote environments (WSL/Docker) fails with "File does not exist" error. The handleDrag method in TreeViewDragAndDropController was using item.asString which contains the untransformed URI, ignoring item.uriListData which contains URIs already processed by the URI transformer during RPC.

Changes

• mainThreadTreeViews.ts: For text/uri-list mime type, reconstruct URI string from uriListData using UriList.create() and URI.revive() instead of raw asString
• mainThreadTreeViews.test.ts: Added test verifying transformed URIs are used over untransformed strings

// Before: always used untransformed string
additionalDataTransfer.replace(type, createStringDataTransferItem(item.asString));

// After: use transformed uriListData when available
const value = type === Mimes.uriList && item.uriListData
    ? UriList.create(item.uriListData.map(part => typeof part === 'string' ? part : URI.revive(part)))
    : item.asString;

Testing

1. Connect to a remote environment (WSL or Docker container)
2. Open a file and find references (Alt+Shift+F12)
3. Drag a file from the references panel to the editor
4. File should open without "File does not exist" error

Original prompt

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This section details on the original issue you should resolve

<issue_title>After searching for a reference and dragging the file, a “File does not exist” error occurs.</issue_title>
<issue_description>
Type: Bug

Behaviour

If I search for a reference and then drag the file, I get a “File does not exist” error.

This issue is likely caused by mixed file path separators (‘/’ and ‘\’).

The file opens fine when opened directly.
There are no issues even with simple searches, not just references.

This occurs $$\color{red}not\ only\ in\ Python\ but\ also\ in\ Go,\ C,\ and\ even\ Markdown$$.

(It works normally in VS Code on the host, not in WSL.)

Steps to reproduce:

1. attach to docker container
2. search reference (Alt + Shift+ F12)
3. drag file to editor
4. FILE NOT FOUND

Diagnostic data

None

Detail

VS Code version: Code 1.107
OS version: Windows_NT x64 10.0.19045
Modes:
Remote OS version: Linux x64 6.6.87.2-microsoft-standard-WSL2
Remote OS version: Linux x64 6.6.87.2-microsoft-standard-WSL2
Remote OS version: Linux x64 6.6.87.2-microsoft-standard-WSL2

User Settings

Installed Extensions

Extension Name	Extension Id	Version
copilot	Git	1.388.0
copilot-chat	Git	0.32.5
csv-to-table	php	1.4.1
debugpy	ms-	2025.16.0
git-graph	mhu	1.30.0
gitlens	eam	17.7.0
go	gol	0.50.0
increase-by-1	nor	1.1.1
indent-rainbow	ode	8.3.1
intellicode-api-usage-examples	Vis	0.2.9
java	red	1.47.0
js-debug	ms-	1.105.0
jupyter	ms-	2025.9.1
jupyter-renderers	ms-	1.3.0
prettier-vscode	esb	11.0.0
python	ms-	2025.18.0
rainbow-csv	mec	3.23.0
rest-client	hum	0.25.1
ruff	cha	2025.28.0
sql-developer	Ora	25.3.1
test-adapter-converter	ms-	0.2.1
vscode-ansi	ili	1.1.7
vscode-eslint	dba	3.0.16
vscode-gradle	vsc	3.17.1
vscode-java-debug	vsc	0.58.3
vscode-java-dependency	vsc	0.26.4
vscode-java-pack	vsc	0.30.4
vscode-java-test	vsc	0.43.2
vscode-js-profile-table	ms-	1.0.10
vscode-jupyter-cell-tags	ms-	0.1.9
vscode-jupyter-powertoys	ms-	0.1.1
vscode-jupyter-slideshow	ms-	0.1.6
vscode-korean-grammar-checker	moo	1.2.5
vscode-language-pack-ko	MS-	1.106.2025111209
vscode-maven	vsc	0.44.0
vscode-pull-request-github	Git	0.120.2
vscode-pylance	ms-	2025.9.1
vscode-python-envs	ms-	1.12.0
vscode-sql-formatter	adp	1.4.4
vscodeintellicode	Vis	1.3.2

System Info

Item	Value
CPUs	Intel(R) Core(TM) i9-14900 (32 x 1997)
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 vulkan: disabled_off webgl: enabled webgl2: enabled webgpu: enabled webnn: disabled_off
Load (avg)	undefined
Memory (System)	63.75GB (32.81GB free)
Process Argv	--crash-reporter-id 95e03ed6-959c-41c5-a78e-a005e4517316
Screen Reader	no
VM	0%

Item	Value
Remote	컨테이너 meritzenv:latest(meritzenv)
OS	Linux x64 6.6.87.2-microsoft-standard-WSL2
CPUs	Intel(R) Core(TM) i9-14900 (32 x 0)
Memory (System)	31.21GB (16.74GB free)
VM	0%

Item	Value
Remote	컨테이너 meritzenv:latest(meritzenv)
OS	Linux x64 6.6.87.2-microsoft-standard-WSL2
CPUs	Intel(R) Core(TM) i9-14900 (32 x 0)
Memory (System)	31.21GB (16.74GB free)
VM	0%

Item	Value
Remote	컨테이너 meritzenv:latest(meritzenv)
OS	Linux x64 6.6.87.2-microsoft-standard-WSL2
CPUs	Intel(R) Core(TM) i9-14900 (32 x 0)
Memory (System)	31.21GB (16.74GB free)
VM	0%

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Comments on the Issue (you are @copilot in this section)

@jrieken @alexr00 I am using the extension tree API and I wonder if the `TreeDragAndDropController` sends dnd data with type `text...

• Fixes After searching for a reference and dragging the file, a “File does not exist” error occurs. #282659

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