src/vs/editor/contrib/multicursor/browser/multicursor.ts/MultiCursorSession/addSelectionToPreviousFindMatch
class MultiCursorSession:	public addSelectionToPreviousFindMatch(): MultiCursorSessionResult | null {
		if (!this._editor.hasModel()) {
			return null;
		}

		const previousMatch = this._getPreviousMatch();
		if (!previousMatch) {
			return null;
		}

		const allSelections = this._editor.getSelections();
		return new MultiCursorSessionResult(allSelections.concat(previousMatch), previousMatch, ScrollType.Smooth);
	}