Limit number of recipients in headers

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

@@ -1322,11 +1322,12 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
             MessageHelper.AddressFormat format = email_format;
 
             if (show_recipients && recipients != null && recipients.length > 0) {
+                int maxRecipients = (compact ? MAX_RECIPIENTS_COMPACT : MAX_RECIPIENTS_NORMAL);
                 tvFrom.setText(context.getString(outgoing && viewType != ViewType.THREAD && compact
                                 ? R.string.title_to_from
                                 : R.string.title_from_to,
-                        MessageHelper.formatAddresses(senders, format, false),
-                        MessageHelper.formatAddresses(recipients, format, false)));
+                        formatAddresses(senders, format, maxRecipients),
+                        formatAddresses(recipients, format, maxRecipients)));
             } else
                 tvFrom.setText(MessageHelper.formatAddresses(senders, format, false));
 
@@ -2195,6 +2196,21 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
             }.setLog(false).execute(context, owner, sargs, "message:tools");
         }
 
+        private String formatAddresses(Address[] addresses, MessageHelper.AddressFormat format, int max) {
+            List<Address> list = new ArrayList<>();
+            if (addresses != null)
+                for (Address address : addresses)
+                    if (!list.contains(address))
+                        list.add(address);
+
+            Address[] sub = list.subList(0, Math.min(list.size(), max)).toArray(new Address[0]);
+            String result = MessageHelper.formatAddresses(sub, format, false);
+            if (list.size() > sub.length)
+                result = context.getString(R.string.title_name_plus, result, list.size() - sub.length);
+
+            return result;
+        }
+
         private Spanned formatAddresses(Address[] addresses, boolean full) {
             return formatAddresses(addresses, full, Integer.MAX_VALUE);
         }