authPrompt: allow empty response to PAM messages

Some PAM modules say "Press enter to continue" or
whatever.  We need to support them.

This commit allows empty responses to PAM questions,
but still requires a non-empty response for username.

https://bugzilla.gnome.org/show_bug.cgi?id=784360

diff --git a/js/gdm/authPrompt.js b/js/gdm/authPrompt.js
index 33bacff58cc560909c17297927c3ebf40f1ce624..4b2509ad78391a340d597f6c36b76a7aead6de5c 100644 (file)
--- a/js/gdm/authPrompt.js
+++ b/js/gdm/authPrompt.js
@@ -188,7 +188,7 @@ const AuthPrompt = new Lang.Class({
                                              if (!this._userVerifier.hasPendingMessages)
                                                  this._fadeOutMessage();
 
-                                             this._updateNextButtonSensitivity(this._entry.text.length > 0);
+                                             this._updateNextButtonSensitivity(this._entry.text.length > 0 || this.verificationStatus == AuthPromptStatus.VERIFYING);
                                          }));
         this._entry.clutter_text.connect('activate', Lang.bind(this, function() {
             if (this.nextButton.reactive)
@@ -416,7 +416,7 @@ const AuthPrompt = new Lang.Class({
     },
 
     updateSensitivity: function(sensitive) {
-        this._updateNextButtonSensitivity(sensitive && this._entry.text.length > 0);
+        this._updateNextButtonSensitivity(sensitive && (this._entry.text.length > 0 || this.verificationStatus == AuthPromptStatus.VERIFYING));
         this._entry.reactive = sensitive;
         this._entry.clutter_text.editable = sensitive;
     },