Used by applyWorkspaceEdits/applyEditsGrouped (src/workspace/editor.ts).
applyWorkspaceEdits
applyEditsGrouped
src/workspace/editor.ts
Simplified: returns pathOrUri itself for a string, or .fsPath for a Uri.
pathOrUri
.fsPath
Honors { language, content } options; otherwise an empty plaintext document.
{ language, content }
Used by
applyWorkspaceEdits/applyEditsGrouped(src/workspace/editor.ts).