Don't make moving the cursor update input

js/demo.js

@@ -740,7 +740,6 @@ class DemoShell {
       this.cursorPos--
       if (this.cursorPos < 0) this.cursorPos = 0
     } else if (action === 'move-cursor-x') {
-      this.copyFromHistoryIndex()
       this.cursorPos = Math.max(0, Math.min(this.history[0].length, this.cursorPos + args[0]))
     } else if (action === 'delete-line') {
       this.copyFromHistoryIndex()