Fix quota capability detection so it can be overwritten by a plugin (#1488655)

CHANGELOG

@@ -1,6 +1,7 @@
 CHANGELOG Roundcube Webmail
 ===========================
 
+- Fix quota capability detection so it can be overwritten by a plugin (#1488655)
 - Fix identity selection on reply (#1488101)
 - Fix Larry's messages list filter in IE (#1488632)
 - Fix more IE issues by disabling Compat. mode with X-UA-Compatible meta tag (#1488626)

program/steps/mail/func.inc

@@ -93,11 +93,13 @@ if (empty($RCMAIL->action) || $RCMAIL->action == 'list') {
   // set current mailbox and some other vars in client environment
   $OUTPUT->set_env('mailbox', $mbox_name);
   $OUTPUT->set_env('pagesize', $RCMAIL->storage->get_pagesize());
-  $OUTPUT->set_env('quota', $RCMAIL->storage->get_capability('QUOTA'));
   $OUTPUT->set_env('delimiter', $RCMAIL->storage->get_hierarchy_delimiter());
   $OUTPUT->set_env('threading', $threading);
   $OUTPUT->set_env('threads', $threading || $RCMAIL->storage->get_capability('THREAD'));
   $OUTPUT->set_env('preview_pane_mark_read', $RCMAIL->config->get('preview_pane_mark_read', 0));
+  if ($RCMAIL->storage->get_capability('QUOTA')) {
+    $OUTPUT->set_env('quota', true);
+  }
 
   if ($CONFIG['delete_junk'])
     $OUTPUT->set_env('delete_junk', true);

program/steps/settings/folders.inc

@@ -414,8 +414,10 @@ function rcmail_rename_folder($oldname, $newname)
 
 $OUTPUT->set_pagetitle(rcube_label('folders'));
 $OUTPUT->include_script('list.js');
-$OUTPUT->set_env('quota', $STORAGE->get_capability('QUOTA'));
 $OUTPUT->set_env('prefix_ns', $STORAGE->get_namespace('prefix'));
+if ($STORAGE->get_capability('QUOTA')) {
+    $OUTPUT->set_env('quota', true);
+}
 
 // add some labels to client
 $OUTPUT->add_label('deletefolderconfirm', 'purgefolderconfirm', 'folderdeleting',