uses standard functions instead of form filters and fixes taglist default

- seems simpler to use the same tag field processing procedures on media
  submit and edit, so now processing with a regular function instead of
  a form filter. Filters run on form load and post by default.
- moved tags to sidebar
- taglist defaults to [] instead of None
- adds case sensitivity toggle

mediagoblin/edit/forms.py

@@ -17,8 +17,6 @@
 
 import wtforms
 
-from mediagoblin.util import convert_to_tag_list
-
 
 class EditForm(wtforms.Form):
     title = wtforms.TextField(

mediagoblin/edit/views.py

@@ -19,8 +19,9 @@ from webob import exc
 from string import split
 
 from mediagoblin import messages
-from mediagoblin.util import render_to_response, redirect, clean_html, \
-                             TAGS_DELIMITER
+from mediagoblin.util import (
+    render_to_response, redirect, clean_html, TAGS_DELIMITER, \
+    convert_to_tag_list)
 from mediagoblin.edit import forms
 from mediagoblin.edit.lib import may_edit_media
 from mediagoblin.decorators import require_active_login, get_user_media_entry
@@ -62,7 +63,7 @@ def edit_media(request, media):
                     media['description']))
 
             media['slug'] = request.POST['slug']
-            media['tags'] = request.POST['tags'].split(TAGS_DELIMITER)
+            media['tags'] = convert_to_tag_list(request.POST['tags'])
             media.save()
 
             return redirect(request, "mediagoblin.user_pages.media_home",