[gnome-shell] authPrompt: Don't begin a new authentication session on lockscreen cancel event

[Marge Bot <marge-bot src gnome org>]

commit 3e96952fde64d2f4ddab76dc9c650a74e1ccf516
Author: Marco Trevisan (Treviño) <mail 3v1n0 net>
Date:   Sat Jan 30 04:18:32 2021 +0100

    authPrompt: Don't begin a new authentication session on lockscreen cancel event
    
    When a cancel event in the user lockscreen happens we first emit a reset
    signal and immediately a cancelled one.
    
    This lead to start a new gdm worker for each enabled authentication
    method and then immediately to stop it.
    As per the previous commit, we don't have anymore dangling gdm workers
    around, but still we should not even start a new one in such case.
    
    So, when the user explicitly cancelled the authentication session, first
    emit a cancelled event and only emit a reset event with a begin request
    if we are outside the lockscreen.
    
    Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1622>

 js/gdm/authPrompt.js | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)
---
diff --git a/js/gdm/authPrompt.js b/js/gdm/authPrompt.js
index 4934290005..43798b3b4b 100644
--- a/js/gdm/authPrompt.js
+++ b/js/gdm/authPrompt.js
@@ -29,6 +29,7 @@ var AuthPromptStatus = {
     VERIFYING: 1,
     VERIFICATION_FAILED: 2,
     VERIFICATION_SUCCEEDED: 3,
+    VERIFICATION_CANCELLED: 4,
 };
 
 var BeginRequestType = {
@@ -479,12 +480,16 @@ var AuthPrompt = GObject.registerClass({
 
         if (oldStatus == AuthPromptStatus.VERIFICATION_FAILED)
             this.emit('failed');
+        else if (oldStatus === AuthPromptStatus.VERIFICATION_CANCELLED)
+            this.emit('cancelled');
 
         let beginRequestType;
 
         if (this._mode == AuthPromptMode.UNLOCK_ONLY) {
             // The user is constant at the unlock screen, so it will immediately
             // respond to the request with the username
+            if (oldStatus === AuthPromptStatus.VERIFICATION_CANCELLED)
+                return;
             beginRequestType = BeginRequestType.PROVIDE_USERNAME;
         } else if (this._userVerifier.serviceIsForeground(OVirt.SERVICE_NAME) ||
                    this._userVerifier.serviceIsForeground(Vmware.SERVICE_NAME) ||
@@ -540,7 +545,7 @@ var AuthPrompt = GObject.registerClass({
         if (this.verificationStatus == AuthPromptStatus.VERIFICATION_SUCCEEDED)
             return;
 
+        this.verificationStatus = AuthPromptStatus.VERIFICATION_CANCELLED;
         this.reset();
-        this.emit('cancelled');
     }
 });