Fix incorrect language selected in language selector (#21648)

tims created 

Due to filtering after enumeration, initial candidate ids are assigned
incorrectly. This later causes the wrong item to be picked up when
accessed via index in the vector.

Change summary

crates/language_selector/src/language_selector.rs | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)

Detailed changes

crates/language_selector/src/language_selector.rs 🔗 

@@ -104,14 +104,15 @@ impl LanguageSelectorDelegate {
         let candidates = language_registry
             .language_names()
             .into_iter()
-            .enumerate()
-            .filter_map(|(candidate_id, name)| {
+            .filter_map(|name| {
                 language_registry
                     .available_language_for_name(&name)?
                     .hidden()
                     .not()
-                    .then(|| StringMatchCandidate::new(candidate_id, name))
+                    .then_some(name)
             })
+            .enumerate()
+            .map(|(candidate_id, name)| StringMatchCandidate::new(candidate_id, name))
             .collect::<Vec<_>>();
 
         Self {