Add Project::onDidChangePaths event

src/atom.coffee

@@ -620,7 +620,7 @@ class Atom extends Model
   watchProjectPath: ->
     onProjectPathChanged = =>
       ipc.send('window-command', 'project-path-changed', @project.getPaths()[0])
-    @subscribe @project, 'path-changed', onProjectPathChanged
+    @subscribe @project.onDidChangePaths(onProjectPathChanged)
     onProjectPathChanged()
 
   exit: (status) ->

src/project.coffee

@@ -6,7 +6,8 @@ fs = require 'fs-plus'
 Q = require 'q'
 {deprecate} = require 'grim'
 {Model} = require 'theorist'
-{Emitter, Subscriber} = require 'emissary'
+{Subscriber} = require 'emissary'
+{Emitter} = require 'event-kit'
 Serializable = require 'serializable'
 TextBuffer = require 'text-buffer'
 {Directory} = require 'pathwatcher'
@@ -35,6 +36,7 @@ class Project extends Model
   ###
 
   constructor: ({path, paths, @buffers}={}) ->
+    @emitter = new Emitter
     @buffers ?= []
 
     for buffer in @buffers
@@ -69,6 +71,19 @@ class Project extends Model
     params.buffers = params.buffers.map (bufferState) -> atom.deserializers.deserialize(bufferState)
     params
 
+
+  ###
+  Section: Event Subscription
+  ###
+
+  onDidChangePaths: (callback) ->
+    @emitter.on 'did-change-paths', callback
+
+  on: (eventName) ->
+    if eventName is 'path-changed'
+      Grim.deprecate("Use Project::onDidChangePaths instead")
+    super
+
   ###
   Section: Accessing the git repository
   ###
@@ -112,6 +127,7 @@ class Project extends Model
       @rootDirectory = null
 
     @emit "path-changed"
+    @emitter.emit 'did-change-paths', projectPaths
   setPath: (path) ->
     Grim.deprecate("Use ::setPaths instead")
     @setPaths([path])

src/workspace-view.coffee

@@ -102,7 +102,7 @@ class WorkspaceView extends View
     @subscribe $(window), 'focus', (e) =>
       @handleFocus(e) if document.activeElement is document.body
 
-    atom.project.on 'path-changed', => @updateTitle()
+    atom.project.onDidChangePaths => @updateTitle()
     @on 'pane-container:active-pane-item-changed', => @updateTitle()
     @on 'pane:active-item-title-changed', '.active.pane', => @updateTitle()
     @on 'pane:active-item-modified-status-changed', '.active.pane', => @updateDocumentEdited()