src/vs/editor/common/tokens/contiguousMultilineTokens.ts/ContiguousMultilineTokens/_insertLines
class ContiguousMultilineTokens:	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._tokens = arrays.arrayInsert(this._tokens, insertIndex, lineTokens);
	}