--- a/Plugins/VcsPlugins/vcsMercurial/HgLogBrowserDialog.py	Sun Feb 12 18:10:27 2017 +0100
+++ b/Plugins/VcsPlugins/vcsMercurial/HgLogBrowserDialog.py	Sun Feb 12 19:01:03 2017 +0100
@@ -2548,7 +2548,7 @@
         @param parent number of parent to diff against
         @type int
         """
-        self.diffEdit.clear()
+        self.diffEdit.setPlainText(self.tr("Generating differences ..."))
         self.diffLabel.setText(self.tr("Differences"))
         self.diffSelectLabel.clear()