Handle 'editor:scroll-to-cursor' command

Add Editor::scrollToCursorPosition in the model layer

spec/editor-spec.coffee

@@ -3028,3 +3028,17 @@ describe "Editor", ->
       editor.setSoftTabs(false)
       editor.normalizeTabsInBufferRange([[0, 0], [Infinity, Infinity]])
       expect(editor.getText()).toBe '     '
+
+  describe ".scrollToCursorPosition()", ->
+    it "scrolls the last cursor into view", ->
+      editor.setCursorScreenPosition([8, 8])
+      editor.setLineHeight(10)
+      editor.setDefaultCharWidth(10)
+      editor.setHeight(50)
+      editor.setWidth(50)
+      expect(editor.getScrollTop()).toBe 0
+      expect(editor.getScrollLeft()).toBe 0
+
+      editor.scrollToCursorPosition()
+      expect(editor.getScrollBottom()).toBe (9 + editor.getVerticalScrollMargin()) * 10
+      expect(editor.getScrollRight()).toBe (9 + editor.getHorizontalScrollMargin()) * 10

src/editor-component.coffee

@@ -215,9 +215,9 @@ EditorComponent = React.createClass
         'editor:join-lines': => editor.joinLines()
         'editor:toggle-indent-guide': => atom.config.toggle('editor.showIndentGuide')
         'editor:toggle-line-numbers': =>  atom.config.toggle('editor.showLineNumbers')
+        'editor:scroll-to-cursor': => editor.scrollToCursorPosition()
         # 'core:page-down': => @pageDown()
         # 'core:page-up': => @pageUp()
-        # 'editor:scroll-to-cursor': => @scrollToCursorPosition()
 
   addCommandListeners: (listenersByCommandName) ->
     {parentView} = @props

src/editor.coffee

@@ -1453,6 +1453,9 @@ class Editor extends Model
   moveCursorToNextWordBoundary: ->
     @moveCursors (cursor) -> cursor.moveToNextWordBoundary()
 
+  scrollToCursorPosition: ->
+    @getCursor().autoscroll()
+
   moveCursors: (fn) ->
     @movingCursors = true
     @batchUpdates =>