--- a/eric6/Plugins/VcsPlugins/vcsPySvn/SvnDiffDialog.py	Mon Oct 12 17:23:15 2020 +0200
+++ b/eric6/Plugins/VcsPlugins/vcsPySvn/SvnDiffDialog.py	Mon Oct 12 17:39:45 2020 +0200
@@ -60,8 +60,7 @@
         self.vcs = vcs
         
         font = Preferences.getEditorOtherFonts("MonospacedFont")
-        self.contents.setFontFamily(font.family())
-        self.contents.setFontPointSize(font.pointSize())
+        self.contents.document().setDefaultFont(font)
         
         self.highlighter = SvnDiffHighlighter(self.contents.document())