Autoscroll to the last cursor in model when inserting text

Fixes #2787

src/selection.coffee

@@ -315,6 +315,7 @@ 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)