src/vs/workbench/services/workingCopy/common/workingCopyEditorService.ts/WorkingCopyEditorService/findEditor
class WorkingCopyEditorService:	findEditor(workingCopy: IWorkingCopy): IEditorIdentifier | undefined {
		for (const editorIdentifier of this.editorService.getEditors(EditorsOrder.MOST_RECENTLY_ACTIVE)) {
			if (this.isOpen(workingCopy, editorIdentifier.editor)) {
				return editorIdentifier;
			}
		}

		return undefined;
	}