Update cursor line when selection screen range changes

spec/app/editor-spec.coffee

@@ -1640,7 +1640,7 @@ describe "Editor", ->
         expect(editor.find('.line-number.cursor-line-number.cursor-line-number-background').length).toBe 0
         expect(editor.find('.line-number.cursor-line-number').text()).toBe "3"
 
-    fit "when a newline is deleted with backspace, the line number of the new cursor position is highlighted (regression)", ->
+    it "when a newline is deleted with backspace, the line number of the new cursor position is highlighted", ->
       editor.setCursorScreenPosition([1,0])
       editor.backspace()
       expect(editor.find('.line-number.cursor-line-number').length).toBe 1

src/app/editor.coffee

@@ -417,6 +417,9 @@ class Editor extends View
     @activeEditSession.on "buffer-path-change", =>
       @trigger 'editor-path-change'
 
+    @activeEditSession.getSelection().on 'change-screen-range', =>
+      @trigger 'editor-selection-change'
+
     @trigger 'editor-path-change'
     @renderWhenAttached()
 

src/app/gutter.coffee

@@ -15,7 +15,11 @@ class Gutter extends View
   afterAttach: (onDom) ->
     return if @attached or not onDom
     @attached = true
-    @editor().on 'cursor-move', => @highlightCursorLine()
+
+    editor = @editor()
+    highlightCursorLine = => @highlightCursorLine()
+    editor.on 'cursor-move', highlightCursorLine
+    editor.on 'editor-selection-change', highlightCursorLine
     @calculateWidth()
 
   editor: ->