4178: undo on note editor goes back to no text; added a reset method to styled text buffer and editor

svn: r15756

src/gui/editors/editnote.py

@@ -266,6 +266,8 @@ class EditNote(EditPrimary):
         if self.obj:
             self.empty = False
             self.texteditor.set_text(self.obj.get_styledtext())
+            # Reset the undoable buffer:
+            self.texteditor.reset()
             _LOG.debug("Initial Note: %s" % str(self.texteditor.get_text()))
         else:
             self.empty = True

src/gui/widgets/styledtexteditor.py

@@ -382,6 +382,12 @@ class StyledTextEditor(gtk.TextView):
             open_menu.show()
             menu.prepend(open_menu)
 
+    def reset(self):
+        """
+        Reset the undoable buffer
+        """
+        self.textbuffer.reset()
+
     # private methods
     
     def _connect_signals(self):

src/gui/widgets/undoablebuffer.py

@@ -194,6 +194,15 @@ class UndoableBuffer(gtk.TextBuffer):
         toggles self.not_undoable_action"""
         self.not_undoable_action = False
     
+    def reset(self):
+        """
+        Resets buffer to initial state.
+        """
+        self.undo_stack[:] = []
+        self.redo_stack[:] = []
+        self.not_undoable_action = False
+        self.undo_in_progress = False
+
     def undo(self):
         """undo inserts or deletions