src/vs/editor/common/core/textChange.ts/TextChangeCompressor/_acceptPrev
class TextChangeCompressor:	private _acceptPrev(prevEdit: TextChange): void {
		this._result[this._resultLen++] = TextChangeCompressor._rebasePrev(this._currDeltaOffset, prevEdit);
		this._prevDeltaOffset += prevEdit.newLength - prevEdit.oldLength;
	}