Autoscroll to selections in model layer when added

Fixes #2698

spec/editor-spec.coffee

@@ -1220,6 +1220,21 @@ describe "Editor", ->
           expect(editor.selectMarker(marker)).toBeFalsy()
           expect(editor.getSelectedBufferRange()).toEqual [[0, 0], [0, 0]]
 
+    describe ".addSelectionForBufferRange(bufferRange)", ->
+      it "adds a selection for the specified buffer range", ->
+        editor.addSelectionForBufferRange([[3, 4], [5, 6]])
+        expect(editor.getSelectedBufferRanges()).toEqual [[[0, 0], [0, 0]], [[3, 4], [5, 6]]]
+
+      it "autoscrolls to the added selection if needed", ->
+        editor.setLineHeightInPixels(10)
+        editor.setDefaultCharWidth(10)
+        editor.setHeight(50)
+        editor.setWidth(50)
+
+        editor.addSelectionForBufferRange([[8, 10], [8, 15]])
+        expect(editor.getScrollTop()).toBe 75
+        expect(editor.getScrollLeft()).toBe 160
+
     describe ".addSelectionBelow()", ->
       describe "when the selection is non-empty", ->
         it "selects the same region of the line below current selections if possible", ->

src/editor.coffee

@@ -1278,7 +1278,9 @@ class Editor extends Model
   # Returns the added {Selection}.
   addSelectionForBufferRange: (bufferRange, options={}) ->
     @markBufferRange(bufferRange, _.defaults(@getSelectionMarkerAttributes(), options))
-    @getLastSelection()
+    selection = @getLastSelection()
+    selection.autoscroll()
+    selection
 
   # Public: Set the selected range in buffer coordinates. If there are multiple
   # selections, they are reduced to a single selection with the given range.