## Pull request overview

[ilimtvtr-alt]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

This PR improves SimpleFileDialog open-validation by allowing folder creation prompts when the selected folder doesn’t exist but a writable ancestor does, and adds a browser test to validate nested folder creation behavior.

Changes:

• Update open-dialog validation to allow creating missing nested folders when an ancestor directory is writable.
• Add canCreateFolder() helper to determine whether folder creation is possible by walking up the URI.
• Add a new browser test covering nested folder creation from a folder-only open dialog.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 4 comments.

File	Description
src/vs/workbench/services/dialogs/test/browser/simpleFileDialog.test.ts	Adds coverage for creating nested missing folders via the open dialog validation path.
src/vs/workbench/services/dialogs/browser/simpleFileDialog.ts	Introduces ancestor-writability check (canCreateFolder) and uses it to decide whether to prompt for folder creation.

Originally posted by @copilot-pull-request-reviewer in microsoft/vscode#321355 (review)