Add ability to copy display buffer markers

spec/app/display-buffer-spec.coffee

@@ -841,3 +841,15 @@ describe "DisplayBuffer", ->
         marker2.on 'destroyed', destroyedHandler
         buffer.getMarker(marker2.id).destroy()
         expect(destroyedHandler).toHaveBeenCalled()
+
+    describe "DisplayBufferMarker.copy(attributes)", ->
+      it "creates a copy of the marker with the given attributes merged in", ->
+        initialMarkerCount = displayBuffer.getMarkerCount()
+        marker1 = displayBuffer.markScreenRange([[5, 4], [5, 10]], a: 1, b: 2)
+        expect(displayBuffer.getMarkerCount()).toBe initialMarkerCount + 1
+
+        marker2 = marker1.copy(b: 3)
+        expect(marker2.getBufferRange()).toEqual marker1.getBufferRange()
+        expect(displayBuffer.getMarkerCount()).toBe initialMarkerCount + 2
+        expect(marker1.getAttributes()).toEqual a: 1, b: 2, invalidation: 'overlap'
+        expect(marker2.getAttributes()).toEqual a: 1, b: 3, invalidation: 'overlap'

src/app/display-buffer-marker.coffee

@@ -27,6 +27,9 @@ class DisplayBufferMarker
 
   ### Public ###
 
+  copy: (attributes) ->
+    @displayBuffer.getMarker(@bufferMarker.copy(attributes).id)
+
   # Gets the screen range of the display marker.
   #
   # Returns a {Range}.
@@ -119,6 +122,9 @@ class DisplayBufferMarker
   clearTail: ->
     @bufferMarker.clearTail()
 
+  hasTail: ->
+    @bufferMarker.hasTail()
+
   # Returns whether the head precedes the tail in the buffer
   isReversed: ->
     @bufferMarker.isReversed()
@@ -146,6 +152,13 @@ class DisplayBufferMarker
     @bufferMarker.destroy()
     @unsubscribe()
 
+  isEqual: (other) ->
+    return false unless other instanceof @constructor
+    @getBufferRange().isEqual(other.getBufferRange()) and
+      @isReversed() is other.isReversed() and
+      @hasTail() is other.hasTail() and
+      _.isEqual(@getAttributes(), other.getAttributes())
+
   # Returns a {String} representation of the marker
   inspect: ->
     "DisplayBufferMarker(id: #{@id}, bufferRange: #{@getBufferRange().inspect()})"

vendor/telepath

@@ -1 +1 @@
-Subproject commit 93c2eff34a3600e0f6c8ea73f7ae01f1f713559d
+Subproject commit 8cc54e7038a474e3c24940f4895e62b278de8a26