Added workaround for Seznam server bug

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

@@ -1285,6 +1285,9 @@ class Core {
             Log.i(folder.name + " " + (duplicate ? "copy" : "move") +
                     " from " + folder.type + " to " + target.type);
 
+            if (!duplicate && account.isSeznam())
+                ifolder.copyMessages(map.keySet().toArray(new Message[0]), itarget);
+            else {
                 List<Message> icopies = new ArrayList<>();
                 for (Message imessage : map.keySet()) {
                     EntityMessage message = map.get(imessage);
@@ -1317,6 +1320,7 @@ class Core {
                 }
 
                 itarget.appendMessages(icopies.toArray(new Message[0]));
+            }
         } else {
             for (Message imessage : map.keySet()) {
                 Log.i((copy ? "Copy" : "Move") + " seen=" + seen + " unflag=" + unflag + " flags=" + imessage.getFlags() + " can=" + canMove);

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

@@ -162,6 +162,10 @@ public class EntityAccount extends EntityOrder implements Serializable {
         return "imap.mail.yahoo.co.jp".equalsIgnoreCase(host);
     }
 
+    boolean isSeznam() {
+        return "imap.seznam.cz".equalsIgnoreCase(host);
+    }
+
     boolean isTransient(Context context) {
         SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
         boolean enabled = prefs.getBoolean("enabled", true);