Finish converting cursors to use markers.

The model layer works at least… haven't tested the view. Will test out
the view once I get the selection model working.

src/app/buffer-change-operation.coffee

@@ -95,8 +95,8 @@ class BufferChangeOperation
 
   restoreMarkers: (markersToRestore) ->
     for [id, previousRange] in markersToRestore
-      if existingMarker = @buffer.validMarkers[id]
-        existingMarker.setRange(previousRange)
-      else
-        @buffer.validMarkers[id] = @buffer.invalidMarkers[id]
+      if validMarker = @buffer.validMarkers[id]
+        validMarker.setRange(previousRange)
+      else if invalidMarker = @buffer.invalidMarkers[id]
+        @buffer.validMarkers[id] = invalidMarker
 

src/app/buffer.coffee

@@ -283,6 +283,10 @@ class Buffer
   markPosition: (position, options) ->
     @markRange([position, position], _.defaults({noTail: true}, options))
 
+  destroyMarker: (id) ->
+    delete @validMarkers[id]
+    delete @invalidMarkers[id]
+
   getMarkerPosition: (args...) ->
     @getMarkerHeadPosition(args...)
 

src/app/cursor.coffee

@@ -12,10 +12,10 @@ class Cursor
   needsAutoscroll: null
 
   constructor: ({@editSession, @marker}) ->
-#     @editSession.observeMarkerHeadScreenPosition @marker, (screenPosition) ->
-#       @needsAutoscroll ?= @isLastCursor()
-#       @trigger 'moved', e
-#       @editSession.trigger 'cursor-moved', e
+    @editSession.observeMarkerHeadScreenPosition @marker, (screenPosition) =>
+      @needsAutoscroll ?= @isLastCursor()
+      @trigger 'moved', screenPosition
+      @editSession.trigger 'cursor-moved', screenPosition
     @needsAutoscroll = true
 
   destroy: ->
@@ -36,7 +36,7 @@ class Cursor
     @goalColumn = null
     @clearSelection()
     @needsAutoscroll = options.autoscroll ? @isLastCursor()
-    @editSession.setMarkerHeadBufferPosition(@marker, screenPosition, options)
+    @editSession.setMarkerHeadBufferPosition(@marker, bufferPosition, options)
 
   getBufferPosition: ->
     @editSession.getMarkerHeadBufferPosition(@marker)

src/app/display-buffer.coffee

@@ -312,6 +312,11 @@ class DisplayBuffer
   markBufferPosition: (bufferPosition) ->
     @buffer.markPosition(bufferPosition)
 
+  destroyMarker: (id) ->
+    @buffer.destroyMarker(id)
+    delete @markerScreenPositionObservers[id]
+    delete @markerScreenPositions[id]
+
   getMarkerScreenRange: (id) ->
     @screenRangeForBufferRange(@getMarkerBufferRange(id))
 
@@ -328,6 +333,7 @@ class DisplayBuffer
     @screenPositionForBufferPosition(@getMarkerHeadBufferPosition(id))
 
   setMarkerHeadScreenPosition: (id, screenPosition, options) ->
+    screenPosition = @clipScreenPosition(screenPosition, options)
     @setMarkerHeadBufferPosition(id, @bufferPositionForScreenPosition(screenPosition, options))
 
   getMarkerHeadBufferPosition: (id) ->
@@ -340,6 +346,7 @@ class DisplayBuffer
     @screenPositionForBufferPosition(@getMarkerTailBufferPosition(id))
 
   setMarkerTailScreenPosition: (id, screenPosition, options) ->
+    screenPosition = @clipScreenPosition(screenPosition, options)
     @setMarkerTailBufferPosition(id, @bufferPositionForScreenPosition(screenPosition, options))
 
   getMarkerTailBufferPosition: (id) ->

src/app/edit-session.coffee

@@ -440,21 +440,48 @@ class EditSession
   markBufferPosition: (args...) ->
     @displayBuffer.markBufferPosition(args...)
 
+  destroyMarker: (args...) ->
+    @displayBuffer.destroyMarker(args...)
+
   getMarkerBufferRange: (args...) ->
     @displayBuffer.getMarkerBufferRange(args...)
 
   getMarkerScreenRange: (args...) ->
     @displayBuffer.getMarkerScreenRange(args...)
 
+  getMarkerScreenPosition: (args...) ->
+    @displayBuffer.getMarkerScreenPosition(args...)
+
   getMarkerBufferPosition: (args...) ->
     @displayBuffer.getMarkerBufferPosition(args...)
 
+  getMarkerHeadScreenPosition: (args...) ->
+    @displayBuffer.getMarkerHeadScreenPosition(args...)
+
+  setMarkerHeadScreenPosition: (args...) ->
+    @displayBuffer.setMarkerHeadScreenPosition(args...)
+
   getMarkerHeadBufferPosition: (args...) ->
     @displayBuffer.getMarkerHeadBufferPosition(args...)
 
+  setMarkerHeadBufferPosition: (args...) ->
+    @displayBuffer.setMarkerHeadBufferPosition(args...)
+
+  getMarkerTailScreenPosition: (args...) ->
+    @displayBuffer.getMarkerTailScreenPosition(args...)
+
+  setMarkerTailScreenPosition: (args...) ->
+    @displayBuffer.setMarkerTailScreenPosition(args...)
+
   getMarkerTailBufferPosition: (args...) ->
     @displayBuffer.getMarkerTailBufferPosition(args...)
 
+  setMarkerTailBufferPosition: (args...) ->
+    @displayBuffer.setMarkerTailBufferPosition(args...)
+
+  observeMarkerHeadScreenPosition: (args...) ->
+    @displayBuffer.observeMarkerHeadScreenPosition(args...)
+
   addAnchor: (options={}) ->
     anchor = @buffer.addAnchor(_.extend({editSession: this}, options))
     @anchors.push(anchor)
@@ -495,7 +522,7 @@ class EditSession
     @addSelection(marker).cursor
 
   addCursorAtBufferPosition: (bufferPosition) ->
-    marker = @markBufferPosition(screenPosition, stayValid: true)
+    marker = @markBufferPosition(bufferPosition, stayValid: true)
     @addSelection(marker).cursor
 
   addCursor: (marker) ->