commit 00166166859c09ce4ba7e209fe84afbe5051a9b6
Author: Fabio Mazza <fab4mazz@gmail.com>
Date:   Sun May 24 12:10:58 2026 +0200

    Prefer immutable sets

diff --git a/app/src/main/java/it/reyboz/bustorino/viewmodels/LinesGridShowingViewModel.kt b/app/src/main/java/it/reyboz/bustorino/viewmodels/LinesGridShowingViewModel.kt
index 1b6762e..16eb930 100644
--- a/app/src/main/java/it/reyboz/bustorino/viewmodels/LinesGridShowingViewModel.kt
+++ b/app/src/main/java/it/reyboz/bustorino/viewmodels/LinesGridShowingViewModel.kt
@@ -29,7 +29,7 @@ class LinesGridShowingViewModel(application: Application) : AndroidViewModel(app
     val isTouristExpanded = MutableLiveData(false)
     val favoritesExpanded = MutableLiveData(true)
 
-    val favoritesLinesIDs = MutableLiveData<HashSet<String>>()
+    val favoritesLinesIDs = MutableLiveData<Set<String>>()
 
     private val queryLiveData = MutableLiveData("")
     fun setLineQuery(query: String){
@@ -81,7 +81,7 @@ class LinesGridShowingViewModel(application: Application) : AndroidViewModel(app
             linesIds.containsAll(it) && it.containsAll(linesIds)
         } ?: false
         if(!sameSet)// trigger LiveData
-            favoritesLinesIDs.value = linesIds
+            favoritesLinesIDs.value = linesIds.toSet()
 
     }