DOn't use spaces for joining strings together in the edit_string, the UX isn't very good.

taggit/tests/tests.py

@@ -235,11 +235,11 @@ class TaggableFormTestCase(BaseTaggingTestCase):
         self.assert_tags_equal(raspberry.tags.all(), [])
         
         f = self.form_class(instance=apple)
-        self.assertEqual(str(f), """<tr><th><label for="id_name">Name:</label></th><td><input id="id_name" type="text" name="name" value="apple" maxlength="50" /></td></tr>\n<tr><th><label for="id_tags">Tags:</label></th><td><input type="text" name="tags" value="delicious green red yummy" id="id_tags" /><br />A comma-separated list of tags.</td></tr>""")
+        self.assertEqual(str(f), """<tr><th><label for="id_name">Name:</label></th><td><input id="id_name" type="text" name="name" value="apple" maxlength="50" /></td></tr>\n<tr><th><label for="id_tags">Tags:</label></th><td><input type="text" name="tags" value="delicious, green, red, yummy" id="id_tags" /><br />A comma-separated list of tags.</td></tr>""")
 
         apple.tags.add('has,comma')
         f = self.form_class(instance=apple)
-        self.assertEqual(str(f), """<tr><th><label for="id_name">Name:</label></th><td><input id="id_name" type="text" name="name" value="apple" maxlength="50" /></td></tr>\n<tr><th><label for="id_tags">Tags:</label></th><td><input type="text" name="tags" value="&quot;has,comma&quot; delicious green red yummy" id="id_tags" /><br />A comma-separated list of tags.</td></tr>""")
+        self.assertEqual(str(f), """<tr><th><label for="id_name">Name:</label></th><td><input id="id_name" type="text" name="name" value="apple" maxlength="50" /></td></tr>\n<tr><th><label for="id_tags">Tags:</label></th><td><input type="text" name="tags" value="&quot;has,comma&quot;, delicious, green, red, yummy" id="id_tags" /><br />A comma-separated list of tags.</td></tr>""")
 
         
 class TaggableFormDirectTestCase(TaggableFormTestCase):
@@ -332,5 +332,5 @@ class TagStringParseTestCase(UnitTestCase):
         self.assertEqual(edit_string_for_tags([plain]), u'plain')
         self.assertEqual(edit_string_for_tags([plain, spaces]), u'plain, spa ces')
         self.assertEqual(edit_string_for_tags([plain, spaces, comma]), u'"com,ma", plain, spa ces')
-        self.assertEqual(edit_string_for_tags([plain, comma]), u'"com,ma" plain')
+        self.assertEqual(edit_string_for_tags([plain, comma]), u'"com,ma", plain')
         self.assertEqual(edit_string_for_tags([comma, spaces]), u'"com,ma", spa ces')

taggit/utils.py

@@ -108,21 +108,13 @@ def edit_string_for_tags(tags):
     <http://django-tagging.googlecode.com/>`_
     """
     names = []
-    use_commas = False
     for tag in tags:
         name = tag.name
         if u',' in name:
             names.append('"%s"' % name)
-            continue
-        elif u' ' in name:
-            if not use_commas:
-                use_commas = True
-        names.append(name)
-    if use_commas:
-        glue = u', '
-    else:
-        glue = u' '
-    return glue.join(sorted(names))
+        else:
+            names.append(name)
+    return u', '.join(sorted(names))
 
 
 def require_instance_manager(func):