Issue #785194 by NancyDru: Better access to tab form.

workflow.module

@@ -44,11 +44,6 @@ function workflow_node_tab_access($node = NULL) {
     return FALSE;
   }
 
-  // View or update node access is needed to grant workflow access
-  if (!node_access('view', $node) || !node_access('update', $node)) {
-    return FALSE;
-  }
-
   $roles = array_keys($user->roles);
   if ($node->uid == $user->uid) {
     $roles = array_merge(array('author'), $roles);

workflow.pages.inc

@@ -117,6 +117,11 @@ function theme_workflow_deleted_state($state_name) {
  *   Form definition array.
  */
 function workflow_tab_form($form_state, $node, $wid, $states, $current) {
+  // Let's make sure we should be here.
+  if (workflow_node_tab_access($node) === FALSE) {
+    return;
+  }
+
   $form['#tab'] = TRUE;
   $choices = workflow_field_choices($node);