Autoscroll *after* inserting text, not before

Fixes #2787

spec/editor-spec.coffee

@@ -785,6 +785,13 @@ describe "Editor", ->
         editor.moveCursorLeft()
         expect(editor.getScrollLeft()).toBe 58 * 10
 
+      it "scrolls down when inserting lines makes the document longer than the editor's height", ->
+        editor.setCursorScreenPosition([13, Infinity])
+        editor.insertNewline()
+        expect(editor.getScrollBottom()).toBe 14 * 10
+        editor.insertNewline()
+        expect(editor.getScrollBottom()).toBe 15 * 10
+
   describe "selection", ->
     selection = null
 

src/selection.coffee

@@ -315,12 +315,14 @@ class Selection extends Model
     wasReversed = @isReversed()
     @clear()
     @cursor.needsAutoscroll = @cursor.isLastCursor()
-    @cursor.autoscroll() if @editor.manageScrollPosition and @cursor.isLastCursor()
 
     if options.indentBasis? and not options.autoIndent
       text = @normalizeIndents(text, options.indentBasis)
 
     newBufferRange = @editor.buffer.setTextInRange(oldBufferRange, text, pick(options, 'undo'))
+
+    @cursor.autoscroll() if @editor.manageScrollPosition and @cursor.isLastCursor()
+
     if options.select
       @setBufferRange(newBufferRange, reversed: wasReversed)
     else