Focus on checkbox when captcha is tabbed into. #250, #333

package.json

@@ -19,6 +19,7 @@
       "*://sys.4chan.org/*",
       "*://a.4cdn.org/*",
       "*://i.4cdn.org/*",
+      "https://www.google.com/recaptcha/api2/anchor?k=6Ldp2bsSAAAAAAJ5uyx_lx34lJeEpTLVkP5k04qc*",
       "*://www.google.com/recaptcha/api/fallback?k=6Ldp2bsSAAAAAAJ5uyx_lx34lJeEpTLVkP5k04qc"
     ],
     "suffix": {

src/General/Main.coffee

@@ -1,7 +1,8 @@
 Main =
   init: ->
     if location.hostname is 'www.google.com'
-      return $.ready -> Captcha.noscript.initFrame()
+      type = if location.pathname is '/recaptcha/api/fallback' then 'noscript' else 'v2'
+      return $.ready -> Captcha[type].initFrame()
 
     g.threads = new SimpleDict()
     g.posts   = new SimpleDict()

src/Posting/Captcha.v2.coffee

@@ -25,6 +25,12 @@ Captcha.v2 =
       # XXX Greasemonkey 1.x workaround to gain access to GM_* functions.
       $.queueTask => @save false
 
+  initFrame: ->
+    $.on window, 'focus', ->
+      $.queueTask ->
+        return unless checkbox = $.id 'recaptcha-anchor'
+        checkbox.focus() unless d.activeElement is checkbox
+
   shouldFocus: false
   timeouts: {}
   postsCount: 0