Refactoring: Created hscommon.desktop

This unit hosts previously awkward UI view methods which weren't related
to the view itself, but to the current desktop environment. These
functions are now at their appropriate place.

core/gui/problem_dialog.py

@@ -6,6 +6,8 @@
 # which should be included with this package. The terms are also available at 
 # http://www.hardcoded.net/licenses/bsd_license
 
+from hscommon import desktop
+
 from .problem_table import ProblemTable
 
 class ProblemDialog:
@@ -20,7 +22,7 @@ class ProblemDialog:
     
     def reveal_selected_dupe(self):
         if self._selected_dupe is not None:
-            self.app.view.reveal_path(self._selected_dupe.path)
+            desktop.reveal_path(self._selected_dupe.path)
     
     def select_dupe(self, dupe):
         self._selected_dupe = dupe