diff -r ccf59c1f0b45 -r c1e5b9f19483 editors/TextViewer.py
--- a/editors/TextViewer.py	Thu Aug 17 16:26:32 2017 +0300
+++ b/editors/TextViewer.py	Thu Aug 17 17:25:17 2017 +0300
@@ -943,8 +943,8 @@
         EditorPanel.RemoveHighlight(self, infos, start, end, highlight_type)
 
         highlight_type = HIGHLIGHT_TYPES.get(highlight_type, None)
-        if (infos[0] == "body" and highlight_type is not None and
-            (infos[1], start, end, highlight_type) in self.Highlights):
+        if infos[0] == "body" and highlight_type is not None and \
+           (infos[1], start, end, highlight_type) in self.Highlights:
             self.Highlights.remove((infos[1], start, end, highlight_type))
             self.RefreshHighlightsTimer.Start(int(REFRESH_HIGHLIGHT_PERIOD * 1000), oneShot=True)