Fix broken tests after relocating parse_tag_list

This annotates the method as `staticmethod`, so it can be used and
tested again without requiring an instance of `ModifyTagsDialog`.

GTG/gtk/browser/modify_tags.py

@@ -47,7 +47,8 @@ def __init__(self, tag_completion, app):
         self.last_apply_to_subtasks = False
 
 
-    def parse_tag_list(self, text):
+    @staticmethod
+    def parse_tag_list(text):
         """ Parse a line of a list of tasks. User can specify if the tag is
         positive or not by prepending '!'.
 

tests/tools/test_tags.py

@@ -20,7 +20,7 @@
 from unittest import TestCase
 
 from GTG.core.tags import extract_tags_from_text
-
+from GTG.gtk.browser.modify_tags import ModifyTagsDialog
 
 class TestExtractTags(TestCase):
     """ extract_tags_from_text """
@@ -75,8 +75,9 @@ def test_accepts_ampersand_in_tag(self):
         self.assertTags("@home&work", ["@home&work"])
 
 
-@unittest.skip('TODO these need to move now that parse_tag_list is inside'
-               ' ModifyTagsDialog')
+# parse_tag_list was previously a free function
+parse_tag_list = ModifyTagsDialog.parse_tag_list
+
 class TestParseTagList(TestCase):
     """ parse_tag_list """