src/vs/editor/common/core/textChange.ts/TextChangeCompressor/constructor
class TextChangeCompressor:	constructor(prevEdits: TextChange[], currEdits: TextChange[]) {
		this._prevEdits = prevEdits;
		this._currEdits = currEdits;

		this._result = [];
		this._resultLen = 0;

		this._prevLen = this._prevEdits.length;
		this._prevDeltaOffset = 0;

		this._currLen = this._currEdits.length;
		this._currDeltaOffset = 0;
	}