src/vs/workbench/common/editor/resourceEditorInput.ts/AbstractResourceEditorInput/shortDescription
class AbstractResourceEditorInput:	private get shortDescription(): string {
		if (typeof this._shortDescription !== 'string') {
			this._shortDescription = this.labelService.getUriBasenameLabel(dirname(this._preferredResource));
		}

		return this._shortDescription;
	}