Added workaround for Zoho search bug

app/src/main/java/eu/faircode/email/Core.java

@@ -2877,6 +2877,11 @@ class Core {
             boolean use_modseq = prefs.getBoolean("use_modseq", true);
             boolean perform_expunge = prefs.getBoolean("perform_expunge", true);
 
+            if (account.isZoho()) {
+                sync_unseen = false;
+                sync_flagged = false;
+            }
+
             Log.i(folder.name + " start sync after=" + sync_days + "/" + keep_days +
                     " quick=" + sync_quick_imap + " force=" + force +
                     " sync unseen=" + sync_unseen + " flagged=" + sync_flagged +

app/src/main/java/eu/faircode/email/EntityAccount.java

@@ -175,6 +175,10 @@ public class EntityAccount extends EntityOrder implements Serializable {
         return "imap.seznam.cz".equalsIgnoreCase(host);
     }
 
+    boolean isZoho() {
+        return (host != null && host.toLowerCase(Locale.ROOT).startsWith("imap.zoho."));
+    }
+
     boolean isTransient(Context context) {
         SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
         boolean enabled = prefs.getBoolean("enabled", true);