vscode-file: Extension development locations are blocked

[sandy081]

Testing #107466

Platform: Windows

• Debugging the tree view sample extension of our extension samples
• In the debugging window, the package explorer icon is not shown

Here is the css it is using

-webkit-mask: url(vscode-file://vscode-app/c:/Work/vscode-extension-samples/tree-view-sample/media/dep.svg) 50% 50% / 24px no-repeat;

It works correctly when I used normal build

[bpasero]

Interesting, the issue is that we do not know about the extension development location here:

vscode/src/vs/code/electron-main/protocol.ts

Lines 28 to 32 in adb9b2c

	const validRoots = coalesce([
	URI.file(environmentService.appRoot),
	environmentService.extensionsPath ? URI.file(environmentService.extensionsPath) : undefined,
	...environmentService.extensionDevelopmentLocationURI ?? []
	]);

Because the location is only present when the second window opens. We will have to find a way to dynamically update the allowed locations based on opened windows.

//cc @deepak1556

[sandy081]

@bpasero Is there a build I can use to verify this?

[bpasero]

No, I think this is fine to not verify as we dont ship this.