fix form_rules rendering in modals, add comments for resolve_ctx

flask_admin/templates/bootstrap2/admin/base.html

@@ -53,6 +53,7 @@
       {{ layout.messages() }}
       {% endblock %}
 
+      {# store the jinja2 context for form_rules rendering logic #}
       {% set render_ctx = h.resolve_ctx() %}
 
       {% block body %}{% endblock %}

flask_admin/templates/bootstrap2/admin/model/modals/create.html

 {% import 'admin/static.html' as admin_static with context%}
 {% import 'admin/lib.html' as lib with context %}
 
+{# store the jinja2 context for form_rules rendering logic #}
+{% set render_ctx = h.resolve_ctx() %}
+
 {% block body %}
   {# "save and add" button is removed from modal (it won't function properly) #}
   {{ lib.render_form(form, return_url, extra=None, form_opts=form_opts,

flask_admin/templates/bootstrap2/admin/model/modals/edit.html

 {% import 'admin/static.html' as admin_static with context%}
 {% import 'admin/lib.html' as lib with context %}
 
+{# store the jinja2 context for form_rules rendering logic #}
+{% set render_ctx = h.resolve_ctx() %}
+
 {% block body %}
   {# "save and continue" button is removed from modal (it won't function properly) #}
   {{ lib.render_form(form, return_url, extra=None, form_opts=form_opts,

flask_admin/templates/bootstrap3/admin/base.html

@@ -64,6 +64,7 @@
       {{ layout.messages() }}
       {% endblock %}
 
+      {# store the jinja2 context for form_rules rendering logic #}
       {% set render_ctx = h.resolve_ctx() %}
 
       {% block body %}{% endblock %}

flask_admin/templates/bootstrap3/admin/model/modals/create.html

 {% import 'admin/static.html' as admin_static with context%}
 {% import 'admin/lib.html' as lib with context %}
 
+{# store the jinja2 context for form_rules rendering logic #}
+{% set render_ctx = h.resolve_ctx() %}
+
 {% block body %}
   <div class="modal-header">
     <button type="button" class="close" data-dismiss="modal" aria-label="Close"><span aria-hidden="true">&times;</span></button>

flask_admin/templates/bootstrap3/admin/model/modals/edit.html

 {% import 'admin/static.html' as admin_static with context%}
 {% import 'admin/lib.html' as lib with context %}
 
+{# store the jinja2 context for form_rules rendering logic #}
+{% set render_ctx = h.resolve_ctx() %}
+
 {% block body %}
   <div class="modal-header">
     <button type="button" class="close" data-dismiss="modal" aria-label="Close"><span aria-hidden="true">&times;</span></button>