Don't count DOM elements for operations count

The number of DOM elements rendered is fluid and using this
number displays inaccurate results as new operations are rendered.

Instead just set the operation count when creating the PathView
based on considering all the operations available.

Closes #502

src/packages/command-panel/lib/path-view.coffee

@@ -14,7 +14,7 @@ class PathView extends View
         @span outlet: 'description', class: 'path-match-number'
       @ul outlet: 'matches', class: 'matches', =>
 
-  initialize: ({@previewList}) ->
+  initialize: ({@previewList, operationCount}) ->
     @pathDetails.on 'mousedown', => @toggle(true)
     @subscribe @previewList, 'command-panel:collapse-result', =>
       if @isSelected()
@@ -27,9 +27,10 @@ class PathView extends View
         @toggle(true)
         false
 
+    @description.text("(#{operationCount})")
+
   addOperation: (operation) ->
     @matches.append new OperationView({operation, @previewList})
-    @description.text("(#{@matches.find('li').length})")
 
   isSelected: ->
     @hasClass('selected') or @find('.selected').length

src/packages/command-panel/lib/preview-list.coffee

@@ -60,7 +60,7 @@ class PreviewList extends ScrollView
   pathViewForPath: (path) ->
     pathView = @viewsForPath[path]
     if not pathView
-      pathView = new PathView({path: path, previewList: this})
+      pathView = new PathView({path: path, previewList: this, operationCount: @getPathOperationCount(path)})
       @viewsForPath[path] = pathView
       @append(pathView)
     pathView
@@ -97,6 +97,9 @@ class PreviewList extends ScrollView
   getPathCount: ->
     _.keys(_.groupBy(@operations, (operation) -> operation.getPath())).length
 
+  getPathOperationCount: (path) ->
+    @operations.filter((operation) -> path is operation.getPath()).length
+
   getOperations: ->
     new Array(@operations...)