make main scroll pane adjustable

app/components/SimpleEditor/panes/Notes/Notes.js

@@ -26,6 +26,8 @@ class Notes extends Component {
     const height = (this.el.el.offsetHeight + this.el.el.offsetTop - e.clientY)
     const scrollPane = document.getElementById('mini-editor-content-panel').children
     scrollPane[0].style.minHeight = height - 40 + 'px'
+    const mainScrollPane = document.getElementById('content-panel').children
+    mainScrollPane[0].style.maxHeight = this.el.el.offsetTop - 140 + 'px'
     this.el.el.style.height = height + 'px'
   }