Add comment for fragment lifecycle checks before showing DownloadDialog

app/src/main/java/org/schabi/newpipe/info_list/dialog/StreamDialogDefaultEntry.java

@@ -113,6 +113,8 @@ public enum StreamDialogDefaultEntry {
     DOWNLOAD(R.string.download, (fragment, item) ->
             fetchStreamInfoAndSaveToDatabase(fragment.requireContext(), item.getServiceId(),
                     item.getUrl(), info -> {
+                        // Ensure the fragment is attached and its state hasn't been saved to avoid
+                        // showing the dialog during lifecycle changes or when the activity is paused.
                         if (fragment.isAdded() && !fragment.isStateSaved()) {
                             final DownloadDialog downloadDialog =
                                     new DownloadDialog(fragment.requireContext(), info);