Merge pull request #1536 from synsun/master

fix view all tags(F7) doesn't work on windows #1526

Author: yanne

AUTHORS.txt

@@ -22,3 +22,4 @@ Kevin Ormbrek
 Timothy Alexander
 @tuds
 @goodwillcoding
+@synsun

src/robotide/ui/tagdialogs.py

@@ -147,7 +147,7 @@ def _search_for_tags(self):
                     self._unique_tags[tag_name].append(test)
                     self._tagit[tag_name].append(tag)
                 else:
-                    self._unique_tags.set(tag_name, [test])
+                    self._unique_tags[tag_name] = [test]
                     self._tagit[tag_name] = [tag]
 
         self.total_test_cases = len(self._test_cases)