Add and use Editor::observeSelections() and ::observeCursors()

src/editor-component.coffee

@@ -345,8 +345,8 @@ EditorComponent = React.createClass
   observeEditor: ->
     {editor} = @props
     @subscribe editor.onDidChangeScreenLines(@onScreenLinesChanged)
-    @subscribe editor.onDidAddCursor(@onCursorAdded)
-    @subscribe editor.onDidAddSelection(@onSelectionAdded)
+    @subscribe editor.observeCursors(@onCursorAdded)
+    @subscribe editor.observeSelections(@onSelectionAdded)
     @subscribe editor.observeDecorations(@onDecorationAdded)
     @subscribe editor.onDidRemoveDecoration(@onDecorationRemoved)
     @subscribe editor.onDidChangeCharacterWidths(@onCharacterWidthsChanged)

src/editor.coffee

@@ -239,6 +239,15 @@ class Editor extends Model
   onDidInsertText: (callback) ->
     @emitter.on 'did-insert-text', callback
 
+  # Extended: Calls your `callback` when a {Cursor} is added to the editor.
+  # Immediately calls your callback for each existing cursor.
+  #
+  # * `callback` {Function}
+  #   * `selection` {Selection} that was added
+  observeCursors: (callback) ->
+    callback(cursor) for cursor in @getCursors()
+    @onDidAddCursor(callback)
+
   # Extended: Calls your `callback` when a {Cursor} is added to the editor.
   #
   # * `callback` {Function}
@@ -266,6 +275,15 @@ class Editor extends Model
   onDidChangeCursorPosition: (callback) ->
     @emitter.on 'did-change-cursor-position', callback
 
+  # Extended: Calls your `callback` when a {Selection} is added to the editor.
+  # Immediately calls your callback for each existing selection.
+  #
+  # * `callback` {Function}
+  #   * `selection` {Selection} that was added
+  observeSelections: (callback) ->
+    callback(selection) for selection in @getSelections()
+    @onDidAddSelection(callback)
+
   # Extended: Calls your `callback` when a {Selection} is added to the editor.
   #
   # * `callback` {Function}