Update the watcher list on click on "watch". #311

Based on a patch contributed by Price M.

app/controllers/watchers_controller.rb

@@ -90,7 +90,12 @@ private
       format.js do
         render(:update) do |page|
           replace_ids.each do |replace_id|
-            page.replace_html replace_id, watcher_link(@watched, user, :replace => replace_ids)
+            case replace_id
+            when 'watchers'
+              page.replace_html 'watchers', :partial => 'watchers/watchers', :locals => {:watched => @watched}
+            else
+              page.replace_html replace_id, watcher_link(@watched, user, :replace => replace_ids)
+            end
           end
         end
       end

app/views/issues/_action_menu.rhtml

@@ -2,7 +2,7 @@
 <%= link_to_if_authorized(l(:button_update), {:controller => 'issues', :action => 'edit', :id => @issue }, :onclick => 'showAndScrollTo("update", "notes"); return false;', :class => 'icon icon-edit', :accesskey => accesskey(:edit)) %>
 <%= link_to_if_authorized l(:button_log_time), {:controller => 'timelog', :action => 'new', :issue_id => @issue}, :class => 'icon icon-time-add' %>
 <% replace_watcher ||= 'watcher' %>
-<%= watcher_tag(@issue, User.current, {:id => replace_watcher, :replace => ['watcher','watcher2']}) %>
+<%= watcher_tag(@issue, User.current, {:id => replace_watcher, :replace => ['watchers','watcher','watcher2']}) %>
 <%= link_to_if_authorized l(:button_duplicate), {:controller => 'issues', :action => 'new', :project_id => @project, :copy_from => @issue }, :class => 'icon icon-duplicate' %>
 <%= link_to_if_authorized l(:button_copy), {:controller => 'issue_moves', :action => 'new', :id => @issue, :copy_options => {:copy => 't'}}, :class => 'icon icon-copy' %>
 <%= link_to_if_authorized l(:button_move), {:controller => 'issue_moves', :action => 'new', :id => @issue}, :class => 'icon icon-move' %>