Use GET instead of POST on roadmap (#718), gantt and calendar forms.

git-svn-id: http://redmine.rubyforge.org/svn/trunk@1388 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/views/projects/roadmap.rhtml

@@ -30,7 +30,7 @@
 <% end %>
 
 <% content_for :sidebar do %>
-<% form_tag do %>
+<% form_tag({}, :method => :get) do %>
 <h3><%= l(:label_roadmap) %></h3>
 <% @trackers.each do |tracker| %>
   <label><%= check_box_tag "tracker_ids[]", tracker.id, (@selected_tracker_ids.include? tracker.id.to_s), :id => nil %>
@@ -38,7 +38,7 @@
 <% end %>
 <br />
 <label for="completed"><%= check_box_tag "completed", 1, params[:completed] %> <%= l(:label_show_completed_versions) %></label>
-<p><%= submit_tag l(:button_apply), :class => 'button-small' %></p>
+<p><%= submit_tag l(:button_apply), :class => 'button-small', :name => nil %></p>
 <% end %>
 
 <h3><%= l(:label_version_plural) %></h3>