fix cursor issue in Firefox

closes antonmedv#111
closes antonmedv#115

codejar.ts

@@ -102,15 +102,6 @@ export function CodeJar(editor: HTMLElement, highlight: (e: HTMLElement, pos?: P
  let {anchorNode, anchorOffset, focusNode, focusOffset} = s
  if (!anchorNode || !focusNode) throw 'error1'
 
- // If the anchor and focus are the editor element, return either a full
- // highlight or a start/end cursor position depending on the selection
- if (anchorNode === editor && focusNode === editor) {
- pos.start = (anchorOffset > 0 && editor.textContent) ? editor.textContent.length : 0
- pos.end = (focusOffset > 0 && editor.textContent) ? editor.textContent.length : 0
- pos.dir = (focusOffset >= anchorOffset) ? '->' : '<-'
- return pos
- }
-
  // Selection anchor and focus are expected to be text nodes,
  // so normalize them.
  if (anchorNode.nodeType === Node.ELEMENT_NODE) {