[fractal/fractal-next] Don't logout on dispose if login not successful

[Julian Sparber <jsparber src gnome org>]

commit f9922e1e1a70d264dac16ab905646a101a67e5a6
Author: Kévin Commaille <zecakeh tedomum fr>
Date:   Mon Nov 1 18:02:19 2021 +0100

    Don't logout on dispose if login not successful
    
    Prevents a crash if you try to login twice.
    
    Fixes #849

 src/session/mod.rs | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/src/session/mod.rs b/src/session/mod.rs
index 3e6d01cf..8c84a650 100644
--- a/src/session/mod.rs
+++ b/src/session/mod.rs
@@ -440,6 +440,8 @@ impl Session {
             Err(error) => {
                 error!("Failed to prepare the session: {}", error);
 
+                priv_.logout_on_dispose.set(false);
+
                 let error_string = error.to_user_facing();
 
                 Some(Error::new(move |_| {