Honor autoscroll option when setting a selection's buffer range

If we pass an explicit autoscroll option when selection, we don't want
to autoscroll the cursor. If the option is true, we'll autoscroll to
the middle of the selection. If the option is false, we don't want any
autoscrolling, including to the cursor. The cursor should only autoscroll
when the option is undefined.

src/app/selection.coffee

@@ -59,6 +59,7 @@ class Selection
     options.reverse ?= @isReversed()
     @editSession.destroyFoldsIntersectingBufferRange(bufferRange) unless options.preserveFolds
     @modifySelection =>
+      @cursor.needsAutoscroll = false if options.autoscroll?
       @editSession.setMarkerBufferRange(@marker, bufferRange, options)
 
   getBufferRowRange: ->