Allow multiple selection of read-only messages, with limitations

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

@@ -3042,6 +3042,8 @@ public class FragmentMessages extends FragmentBase implements SharedPreferences.
                         folder = db.folder().getFolder(message.folder);
                         if (folder == null)
                             continue;
+                        if (folder.read_only)
+                            result.read_only = true;
                         folders.put(folder.id, folder);
                     }
 
@@ -3213,6 +3215,7 @@ public class FragmentMessages extends FragmentBase implements SharedPreferences.
                     popupMenu.getMenu().add(Menu.NONE, R.string.title_raw_send, order++, R.string.title_raw_send)
                             .setIcon(R.drawable.twotone_attachment_24);
 
+                if (!result.read_only) {
                     if (result.hasInbox && !result.isInbox) // not is inbox
                         popupMenu.getMenu().add(Menu.FIRST, R.string.title_folder_inbox, order++, R.string.title_folder_inbox)
                                 .setIcon(R.drawable.twotone_move_to_inbox_24);
@@ -3250,6 +3253,7 @@ public class FragmentMessages extends FragmentBase implements SharedPreferences.
                     if (result.copyto != null)
                         popupMenu.getMenu().add(Menu.FIRST, R.string.title_copy_to, order++, R.string.title_copy_to)
                                 .setIcon(R.drawable.twotone_file_copy_24);
+                }
 
                 popupMenu.insertIcons(context);
 
@@ -8824,6 +8828,7 @@ public class FragmentMessages extends FragmentBase implements SharedPreferences.
         boolean hasImap;
         boolean hasPop;
         Boolean leave_deleted;
+        boolean read_only;
         List<Long> folders;
         List<EntityAccount> accounts;
         EntityAccount copyto;

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

@@ -49,7 +49,7 @@ public class SelectionPredicateMessage extends SelectionTracker.SelectionPredica
         if (message.accountProtocol != EntityAccount.TYPE_IMAP)
             return true;
 
-        if (message.uid != null && !message.folderReadOnly)
+        if (message.uid != null)
             return true;
 
         return false;