SONAR-3932 problems with "Raw" link in Violations drilldown

=> For user without Code Viewer role

plugins/sonar-core-plugin/src/main/resources/org/sonar/l10n/core.properties

@@ -1075,6 +1075,7 @@ coverage_viewer.overall_tests=All Tests
 # GENERIC CODE VIEWER
 #
 #------------------------------------------------------------------------------
+code_viewer.no_info_displayed_due_to_security=Due to security settings, no information can be displayed.
 code_viewer.create_violation.new_rule=New Rule
 code_viewer.create_violation.rules=Rules
 code_viewer.create_violation.submit=Create Violation

plugins/sonar-design-plugin/src/main/java/org/sonar/plugins/design/ui/dependencies/DependenciesViewer.java

@@ -33,7 +33,7 @@ import org.sonar.api.web.UserRole;
 @ResourceQualifier({Qualifiers.FILE, Qualifiers.CLASS, Qualifiers.PACKAGE, Qualifiers.PROJECT, Qualifiers.MODULE})
 @DefaultTab(metrics = {CoreMetrics.AFFERENT_COUPLINGS_KEY, CoreMetrics.EFFERENT_COUPLINGS_KEY})
 @NavigationSection({NavigationSection.RESOURCE_TAB})
-@UserRole(UserRole.USER)
+@UserRole(UserRole.CODEVIEWER)
 public class DependenciesViewer extends AbstractRubyTemplate implements RubyRailsPage {
 
   public String getId() {

sonar-server/src/main/webapp/WEB-INF/app/views/resource/_tabs.html.erb

@@ -1,7 +1,13 @@
 <%
-   display_title=(params[:display_title]=='true')
-   if display_title
+   if @extensions.empty?
 %>
+  <span class="note"><%= message('code_viewer.no_info_displayed_due_to_security') -%></span>
+<%
+   else
+     display_title=(params[:display_title]=='true')
+%>
+     
+<% if display_title %>
   <div id="source_title">
     <%
        selected_project_id = params[:project].to_i
@@ -19,7 +25,7 @@
   <ul class="tablinks">
     <%
        first=true
-       if @snapshot.source
+       if @snapshot.source && has_role?(:codeviewer, @snapshot)
     %>
       <li class="<%= 'first' if first -%>">
         <a href="<%= ApplicationController.root_context -%>/api/sources?resource=<%= @resource.key -%>&amp;format=txt"><%= message('raw') -%></a>
@@ -56,3 +62,5 @@
     </li>
   </ul>
 </div>
+
+<%  end %>