For #22784: Show collection snackbar only if fragment is still attached.

app/src/main/java/org/mozilla/fenix/tabstray/TabsTrayFragment.kt

@@ -42,6 +42,7 @@ import org.mozilla.fenix.databinding.TabstrayMultiselectItemsBinding
 import org.mozilla.fenix.ext.components
 import org.mozilla.fenix.ext.metrics
 import org.mozilla.fenix.ext.requireComponents
+import org.mozilla.fenix.ext.runIfFragmentIsAttached
 import org.mozilla.fenix.ext.settings
 import org.mozilla.fenix.home.HomeScreenViewModel
 import org.mozilla.fenix.share.ShareFragment
@@ -485,6 +486,7 @@ class TabsTrayFragment : AppCompatDialogFragment() {
         isNewCollection: Boolean = false,
         collectionToSelect: Long?
     ) {
+        runIfFragmentIsAttached {
             FenixSnackbar
                 .make(requireView())
                 .collectionMessage(tabSize, isNewCollection)
@@ -498,6 +500,7 @@ class TabsTrayFragment : AppCompatDialogFragment() {
                     dismissTabsTray()
                 }.show()
         }
+    }
 
     @VisibleForTesting
     internal fun showBookmarkSnackbar(