Send context menu commands without focused window

The context menu always knows what window it is bound to so
start supporting running context menus on non-focused windows.

Previously these would either fail silently or log an error
if focusedWindow() returned null and the command wasn't guarding
against it.

src/browser/atom-application.coffee

@@ -140,7 +140,9 @@ class AtomApplication
     @on 'application:open-file', -> @promptForPath(type: 'file')
     @on 'application:open-folder', -> @promptForPath(type: 'folder')
     @on 'application:open-dev', -> @promptForPath(devMode: true)
-    @on 'application:inspect', ({x,y}) -> @focusedWindow().browserWindow.inspectElement(x, y)
+    @on 'application:inspect', ({x,y}, atomWindow=@focusedWindow()) ->
+      atomWindow?.browserWindow?.inspectElement(x, y)
+
     @on 'application:open-documentation', -> shell.openExternal('https://atom.io/docs/latest/?app')
     @on 'application:install-update', -> @autoUpdateManager.install()
     @on 'application:check-for-update', => @autoUpdateManager.check()
@@ -228,6 +230,18 @@ class AtomApplication
       else
         @sendCommandToFirstResponder(command)
 
+  # Public: Executes the given command on the given window.
+  #
+  # command - The string representing the command.
+  # atomWindow - The {AtomWindow} to send the command to.
+  # args - The optional arguments to pass along.
+  sendCommandToWindow: (command, atomWindow, args...) ->
+    unless @emit(command, args..., atomWindow)
+      if atomWindow?
+        atomWindow.sendCommand(command, args...)
+      else
+        @sendCommandToFirstResponder(command)
+
   # Translates the command into OS X action and sends it to application's first
   # responder.
   sendCommandToFirstResponder: (command) ->

src/browser/atom-window.coffee

@@ -107,7 +107,7 @@ class AtomWindow
         when 1 then @browserWindow.restart()
 
     @browserWindow.on 'context-menu', (menuTemplate) =>
-      new ContextMenu(menuTemplate, @browserWindow)
+      new ContextMenu(menuTemplate, this)
 
     if @isSpec
       # Spec window's web view should always have focus

src/browser/context-menu.coffee

@@ -2,10 +2,10 @@ Menu = require 'menu'
 
 module.exports =
 class ContextMenu
-  constructor: (template, browserWindow) ->
+  constructor: (template, @atomWindow) ->
     template = @createClickHandlers(template)
     menu = Menu.buildFromTemplate(template)
-    menu.popup(browserWindow)
+    menu.popup(@atomWindow.browserWindow)
 
   # It's necessary to build the event handlers in this process, otherwise
   # closures are drug across processes and failed to be garbage collected
@@ -14,6 +14,7 @@ class ContextMenu
     for item in template
       if item.command
         (item.commandOptions ?= {}).contextCommand = true
-        item.click = do (item) ->
-          => global.atomApplication.sendCommand(item.command, item.commandOptions)
+        do (item) =>
+          item.click = =>
+            global.atomApplication.sendCommandToWindow(item.command, @atomWindow, item.commandOptions)
       item