--- a/eric6/UI/DiffDialog.py	Tue Apr 13 18:02:59 2021 +0200
+++ b/eric6/UI/DiffDialog.py	Tue Apr 13 19:59:17 2021 +0200
@@ -101,10 +101,7 @@
         filesystem.
         """
         dname, fname = Utilities.splitPath(self.filename2)
-        if fname != '.':
-            fname = "{0}.diff".format(self.filename2)
-        else:
-            fname = dname
+        fname = "{0}.diff".format(self.filename2) if fname != '.' else dname
             
         fname, selectedFilter = E5FileDialog.getSaveFileNameAndFilter(
             self,