Merge pull request #3879 from deltachat/adb/issue-3878

call dcContext.deleteMsgs() in background thread

Author: adbenitez

src/main/java/org/thoughtcrime/securesms/MessageSelectorFragment.java

@@ -86,7 +86,7 @@ protected void handleDeleteMessages(int chatId, final int[] messageIds) {
       .setCancelable(true)
       .setNeutralButton(android.R.string.cancel, null)
       .setPositiveButton(positiveBtnLabel, (d, which) -> {
-        dcContext.deleteMsgs(messageIds);
+        Util.runOnAnyBackgroundThread(() -> dcContext.deleteMsgs(messageIds));
         if (actionMode != null) actionMode.finish();
       });