github copilot can't drag folder in devcontainer

[txone]

Can't drag folder to copilot chat in devcontainer

• Copilot Chat Extension Version: 0.27.2025040402
• VS Code Version: 1.100.0-insider
• OS Version: windows 11

Steps to Reproduce:

1. frag folder
2. drop to chat

[benibenj]

Matt Bierner (@mjbvz) Daniel Imms (@Tyriar) Folder DnD is broken in remote since this change #243656. This did not only break chat folder dnd but also other features like dragging a folder into the editor when in a remote window. Since that change, extractEditorsDropData does not return any dragged resources on remote anymore.

[mjbvz]

Benjamin Christopher Simmonds (@benibenj) Thanks. I think this is the fallout of fixing a bug and should be fixed in copilot chat

In #243656 I fixed a bug that caused isDirectory to not correctly be set on dragged items. Looking over fillEditorsDragData, I believe that DataTransfers.RESOURCES was never supposed to contain directories. I also believe extractEditorsDropData was meant to return files, not all dragged resources such as folders. After I fixed this bug, this should now be what you see

What likely should happen is resolveAttachmentsFromDragEvent should fall back to looking at the text/url-list if extractEditorsDropData returns empty. However I think other places such as guessDropType also need to fix this

Can you please take a look since you know more about the chat dnd code?

[benibenj]

Matt Bierner (@mjbvz) It seem like the behaviours are not the same when running locally vs remote currently

• Locally: extractEditorsDropData includes folder resources
• Remote: extractEditorsDropData does not include folder resources

I'm fine with adopting any change needed for chat dnd, but I think we first need to make sure that extractEditorsDropData consistently returns the same data, whether in remote or not.

// cc Benjamin Pasero (@bpasero) FYI regarding current breakages for dragging folders into editor area in remote.