revert to local const buffer

src/Buffer.ts

@@ -34,7 +34,6 @@ export class Buffer implements IBuffer {
   public savedY: number;
   public savedX: number;
   public markers: Marker[] = [];
-  public lines: CircularList<LineData>;
 
   /**
    * Create a new Buffer.
@@ -49,6 +48,10 @@ export class Buffer implements IBuffer {
     this.clear();
   }
 
+  public get lines(): CircularList<LineData> {
+    return this._lines;
+  }
+
   public get hasScrollback(): boolean {
     return this._hasScrollback && this.lines.maxLength > this._terminal.rows;
   }
@@ -95,7 +98,6 @@ export class Buffer implements IBuffer {
     this.y = 0;
     this.x = 0;
     this._lines = new CircularList<LineData>(this._getCorrectBufferLength(this._terminal.rows));
-    this.lines = this._lines;
     this.scrollTop = 0;
     this.scrollBottom = this._terminal.rows - 1;
     this.setupTabStops();