src/vs/editor/common/tokens/contiguousTokensStore.ts/ContiguousTokensStore/_insertLines
class ContiguousTokensStore:	private _insertLines(insertIndex: number, insertCount: number): void {
		if (insertCount === 0) {
			return;
		}
		const lineTokens: (Uint32Array | ArrayBuffer | null)[] = [];
		for (let i = 0; i < insertCount; i++) {
			lineTokens[i] = null;
		}
		this._lineTokens = arrays.arrayInsert(this._lineTokens, insertIndex, lineTokens);
		this._len += insertCount;
	}