Stop media editor prompting to save changes on cancellation when none made. Bug #2364

svn: r11030

src/Editors/_EditMedia.py

@@ -285,6 +285,29 @@ class EditMedia(EditPrimary):
         Config.set(Config.MEDIA_HEIGHT, height)
         Config.sync()
 
+    def data_has_changed(self):
+        """
+        A date comparison can fail incorrectly because we have made the
+        decision to store entered text in the date. However, there is no
+        entered date when importing from a XML file, so we can get an
+        incorrect fail.
+        """
+        
+        if self.db.readonly:
+            return False
+        elif self.obj.handle:
+            orig = self.get_from_handle(self.obj.handle)
+            if orig:
+                cmp_obj = orig
+            else:
+                cmp_obj = self.empty_object()
+            return cmp(cmp_obj.serialize(True)[1:],
+                       self.obj.serialize(True)[1:]) != 0
+        else:
+            cmp_obj = self.empty_object()
+            return cmp(cmp_obj.serialize(True)[1:],
+                       self.obj.serialize()[1:]) != 0
+
 class DeleteMediaQuery:
 
     def __init__(self, dbstate, uistate, media_handle, the_lists):

src/gen/lib/mediaobj.py

@@ -83,7 +83,7 @@ class MediaObject(SourceBase, NoteBase, DateBase, AttributeBase,
             self.desc = ""
             self.thumb = None
 
-    def serialize(self):
+    def serialize(self, no_text_date = False):
         """
         Convert the data held in the event to a Python tuple that
         represents all the data elements. 
@@ -106,7 +106,7 @@ class MediaObject(SourceBase, NoteBase, DateBase, AttributeBase,
                 SourceBase.serialize(self),
                 NoteBase.serialize(self),
                 self.change,
-                DateBase.serialize(self),
+                DateBase.serialize(self, no_text_date),
                 self.marker.serialize(),
                 self.private)