src/vs/editor/common/model/textModelTokens.ts/TokenizationStateStore/applyEdits
class TokenizationStateStore:	public applyEdits(range: IRange, eolCount: number): void {
		this.markMustBeTokenized(range.startLineNumber - 1);

		this._lineBeginState.delete(range.startLineNumber, range.endLineNumber - range.startLineNumber);
		this._lineNeedsTokenization.delete(range.startLineNumber, range.endLineNumber - range.startLineNumber);

		this._lineBeginState.insert(range.startLineNumber, eolCount);
		this._lineNeedsTokenization.insert(range.startLineNumber, eolCount);
	}