update files

static/js/terminal/lib/scrollDisp.js

@@ -5,6 +5,46 @@
 'use strict';
 
 module.exports = function (Terminal){
+  Terminal.prototype.scroll = function (){
+    var row;
+
+    if (++this.ybase === this.scrollback) {
+      this.ybase = this.ybase / 2 | 0;
+      this.lines = this.lines.slice(-(this.ybase + this.rows) + 1);
+    }
+
+    this.ydisp = this.ybase;
+
+    // last line
+    row = this.ybase + this.rows - 1;
+
+    // subtract the bottom scroll region
+    row -= this.rows - 1 - this.scrollBottom;
+
+    if (row === this.lines.length) {
+      // potential optimization:
+      // pushing is faster than splicing
+      // when they amount to the same
+      // behavior.
+      this.lines.push(this.blankLine());
+    } else {
+      // add our new line
+      this.lines.splice(row, 0, this.blankLine());
+    }
+
+    if (this.scrollTop !== 0) {
+      if (this.ybase !== 0) {
+        this.ybase--;
+        this.ydisp = this.ybase;
+      }
+
+      this.lines.splice(this.ybase + this.scrollTop, 1);
+    }
+
+    this.updateRange(this.scrollTop);
+    this.updateRange(this.scrollBottom);
+  };
+
   Terminal.prototype.scrollDisp = function (disp){
     this.ydisp += disp;