src/vs/editor/common/tokens/contiguousTokensEditing.ts/ContiguousTokensEditing/deleteBeginning
class ContiguousTokensEditing:	public static deleteBeginning(lineTokens: Uint32Array | ArrayBuffer | null, toChIndex: number): Uint32Array | ArrayBuffer | null {
		if (lineTokens === null || lineTokens === EMPTY_LINE_TOKENS) {
			return lineTokens;
		}
		return ContiguousTokensEditing.delete(lineTokens, 0, toChIndex);
	}