Upgrade to rich-text 2.0

rich-text delta compose and transform no longer self-modifying.
Fixes #296

package.json

@@ -50,7 +50,7 @@
     "lodash": "~3.9.1",
     "lodash-cli": "~3.9.3",
     "protractor": "~1.8.0",
-    "rich-text": "~1.1.0",
+    "rich-text": "~2.0.0",
     "stylify": "~1.0.0",
     "stylus": "~0.51.1",
     "through": "~2.3.7",

src/core/editor.coffee

@@ -70,7 +70,7 @@ class Editor
     return clearInterval(@timer) unless @root.parentNode?
     delta = this._update()
     if delta
-      @delta.compose(delta)
+      @delta = @delta.compose(delta)
       @length = @delta.length()
       @quill.emit(@quill.constructor.events.TEXT_CHANGE, delta, source)
     source = Editor.sources.SILENT if delta

src/modules/paste-manager.coffee

@@ -21,7 +21,7 @@ class PasteManager
       lengthAdded = Math.max(0, delta.length() - 1)
       if lengthAdded > 0
         # Need to remove trailing newline so paste is inline, losing format is expected and observed in Word
-        delta.compose(new Delta().retain(lengthAdded).delete(1))
+        delta = delta.compose(new Delta().retain(lengthAdded).delete(1))
         delta.ops.unshift({ retain: range.start }) if range.start > 0
         delta.delete(range.end - range.start)
         @quill.updateContents(delta, 'user')

test/unit/core/quill.coffee

@@ -203,6 +203,19 @@ describe('Quill', ->
       bold.insertBefore(document.createTextNode('a'), bold.lastChild)
       @quill.editor.checkUpdate()
     )
+
+    it('immutability', (done) ->
+      @quill.setHTML('<div>123</div>')
+      expected = new Quill.Delta().insert('0')
+      @quill.once('text-change', (delta) =>
+        expect(delta).toEqualDelta(expected)
+        delta.compose(new Quill.Delta().insert('^'))
+      ).once('text-change', (delta) =>
+        expect(delta).toEqualDelta(expected)
+        done()
+      )
+      @quill.insertText(0, '0')
+    )
   )
 
   describe('_buildParams()', ->