Fix shielded sync scanned progress bar limit

.changelog/unreleased/bug-fixes/4046-ss-scanned-tracker-total.md

@@ -0,0 +1,2 @@
+- Fix the limit of the scanned progress bar in shielded sync being lower than
+  the current value. ([\#4046](https://github.com/anoma/namada/pull/4046))

crates/shielded_token/src/masp/shielded_sync/dispatcher.rs

@@ -557,7 +557,7 @@ where
 
         self.config
             .scanned_tracker
-            .set_upper_limit(self.cache.fetched.len() as u64);
+            .set_upper_limit(self.cache.fetched.shielded_outputs() as u64);
         self.config.applied_tracker.set_upper_limit(
             self.cache.trial_decrypted.successful_decryptions() as u64,
         );
@@ -667,9 +667,9 @@ where
                 self.cache.fetched.extend(tx_batch);
 
                 self.config.fetched_tracker.increment_by(to.0 - from.0 + 1);
-                self.config
-                    .scanned_tracker
-                    .set_upper_limit(self.cache.fetched.len() as u64);
+                self.config.scanned_tracker.set_upper_limit(
+                    self.cache.fetched.shielded_outputs() as u64,
+                );
             }
             Message::FetchTxs(Err(TaskError {
                 error,

crates/shielded_token/src/masp/shielded_sync/utils.rs

@@ -134,9 +134,16 @@ impl Fetched {
         self.txs.is_empty()
     }
 
-    /// Check the length of the fetched cache
-    pub fn len(&self) -> usize {
-        self.txs.len()
+    /// Return the number of shielded outputs in the cache
+    pub fn shielded_outputs(&self) -> usize {
+        self.txs
+            .values()
+            .map(|shielded| {
+                shielded
+                    .sapling_bundle()
+                    .map_or(0, |x| x.shielded_outputs.len())
+            })
+            .sum::<usize>()
     }
 }