[fenix] For https://github.com/mozilla-mobile/fenix/issues/25563: Show Snackbar only if fragment is still attached.

app/src/main/java/org/mozilla/fenix/library/historymetadata/HistoryMetadataGroupFragment.kt

@@ -35,6 +35,7 @@ import org.mozilla.fenix.ext.requireComponents
 import org.mozilla.fenix.ext.setTextColor
 import org.mozilla.fenix.ext.showToolbar
 import org.mozilla.fenix.ext.components
+import org.mozilla.fenix.ext.runIfFragmentIsAttached
 import org.mozilla.fenix.ext.toShortUrl
 import org.mozilla.fenix.library.LibraryPageFragment
 import org.mozilla.fenix.library.history.History
@@ -231,11 +232,13 @@ class HistoryMetadataGroupFragment :
     }
 
     private fun allDeletedSnackbar() {
+        runIfFragmentIsAttached {
             showSnackBar(
-            requireView(),
+                binding.root,
                 getString(R.string.delete_history_group_snackbar)
             )
         }
+    }
 
     private fun showTabTray() {
         findNavController().nav(