fix: infinite dialogs with network mount failure (#1956)

Selecting a broken network mount triggers an infinite loop of dialogs
that requires killing the app:

1. Click invalid network mount
2. Try to mount network path
3. Show failure dialog
4. Trigger `NetworkDriveOpenEntityAfterMount`
* BUG: This fires even if the mount failed or the user canceled the
dialog!
6. Goto 2

Fix by having `network_drive(...)` return a Boolean indicating whether
the mount actually happened and using that to break the infinite error
loop.

Fixes #1629 

Sample broken network path that triggers the infinite dialog when
selected:

**~/.config/cosmic/com.system76.CosmicFiles/v1/favorites**

```ron
[
    Home,
    Documents,
    Downloads,
    Network(
        uri: "sftp://myserver/shared",
        name: "",
        path: "/tmp/fake-network/sftp-host=myserver/mnt",
    ),
]
```

- [x] I have disclosed use of any AI generated code in my commit
messages.
- [x] I understand these changes in full and will be able to respond to
review comments.
- [x] My change is accurately described in the commit message.
- [x] My contribution is tested and working as described.
- [x] I have read the [Developer Certificate of
Origin](https://developercertificate.org/) and certify my contribution
under its conditions.

src/app.rs

@@ -2678,10 +2678,14 @@ impl Application for App {
                         })
                         && let Some(mounter) = MOUNTERS.get(&key)
                     {
-                        return mounter.network_drive(uri.clone()).map(move |()| {
-                            cosmic::Action::App(Message::NetworkDriveOpenEntityAfterMount {
-                                entity,
-                            })
+                        return mounter.network_drive(uri.clone()).map(move |mounted| {
+                            if mounted {
+                                cosmic::Action::App(Message::NetworkDriveOpenEntityAfterMount {
+                                    entity,
+                                })
+                            } else {
+                                cosmic::action::none()
+                            }
                         });
                     }
 
@@ -3586,7 +3590,7 @@ impl Application for App {
                         Some((*mounter_key, self.network_drive_input.clone()));
                     return mounter
                         .network_drive(self.network_drive_input.clone())
-                        .map(|()| cosmic::action::none());
+                        .map(|_| cosmic::action::none());
                 }
                 log::warn!(
                     "no mounter found for connecting to {:?}",

src/mounter/gvfs.rs

@@ -659,7 +659,7 @@ impl Mounter for Gvfs {
         )
     }
 
-    fn network_drive(&self, uri: String) -> Task<()> {
+    fn network_drive(&self, uri: String) -> Task<bool> {
         let command_tx = self.command_tx.clone();
         Task::perform(
             async move {
@@ -668,9 +668,15 @@ impl Mounter for Gvfs {
                 command_tx.send(Cmd::NetworkDrive(uri, res_tx)).unwrap();
                 res_rx.await
             },
-            |x| {
-                if let Err(err) = x {
+            |result| match result {
+                Ok(Ok(())) => true,
+                Ok(Err(err)) => {
                     log::error!("{err:?}");
+                    false
+                }
+                Err(err) => {
+                    log::error!("{err:?}");
+                    false
                 }
             },
         )

src/mounter/mod.rs

@@ -114,7 +114,7 @@ pub trait Mounter: Send + Sync {
     fn items(&self, sizes: IconSizes) -> Option<MounterItems>;
     //TODO: send result
     fn mount(&self, item: MounterItem) -> Task<()>;
-    fn network_drive(&self, uri: String) -> Task<()>;
+    fn network_drive(&self, uri: String) -> Task<bool>;
     fn network_scan(&self, uri: &str, sizes: IconSizes) -> Option<Result<Vec<tab::Item>, String>>;
     fn dir_info(&self, uri: &str) -> Option<(String, String, Option<PathBuf>)>;
     fn unmount(&self, item: MounterItem) -> Task<()>;