[gnome-shell/gnome-3-16] gdm: make user list fade-in on vt switch more reliable

[Ray Strode <halfline src gnome org>]

commit 84509886f7854578688127d4ed5bc705a4433acf
Author: Ray Strode <rstrode redhat com>
Date:   Tue Aug 4 09:53:04 2015 -0400

    gdm: make user list fade-in on vt switch more reliable
    
    We fade out the authentication prompt when a user successfully
    logs into a user session. We reset it and fade it back in when
    the user switches back to the login screen VT.
    
    The problem is, we only fade it back in if the auth prompt status is
    VERIFICATION_SUCCEEDED.  It's possible for it to be NOT_VERIFYING
    if the authprompt gets reset for some other reason in the interim.
    
    This commit changes the check to be more precise. We now only skip
    the fade-in, if we're already faded in, and we only skip the reset if
    we're already reset.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=753181

 js/gdm/loginDialog.js |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)
---
diff --git a/js/gdm/loginDialog.js b/js/gdm/loginDialog.js
index 0dabacd..c56651b 100644
--- a/js/gdm/loginDialog.js
+++ b/js/gdm/loginDialog.js
@@ -874,7 +874,7 @@ const LoginDialog = new Lang.Class({
     },
 
     _loginScreenSessionActivated: function() {
-        if (this._authPrompt.verificationStatus != AuthPrompt.AuthPromptStatus.VERIFICATION_SUCCEEDED)
+        if (this.actor.opacity == 255 && this._authPrompt.verificationStatus == 
AuthPrompt.AuthPromptStatus.NOT_VERIFYING)
             return;
 
         Tweener.addTween(this.actor,
@@ -891,7 +891,8 @@ const LoginDialog = new Lang.Class({
                            },
                            onUpdateScope: this,
                            onComplete: function() {
-                               this._authPrompt.reset();
+                               if (this._authPrompt.verificationStatus != 
AuthPrompt.AuthPromptStatus.NOT_VERIFYING)
+                                   this._authPrompt.reset();
                            },
                            onCompleteScope: this });
     },