Avoid groups are defined multiple

Groups defined by the contexts from the keymap may appear twice. This
might need more investigation and maybe the code could make easier but
for now we do not have one group shown multiple.

lib/python/Components/HelpMenuList.py

@@ -136,15 +136,20 @@ def actMapId():
 
 		l = []
 		extendedPadding = (None, ) if formatFlags & self.EXTENDED else ()
-
+		groups = []
 		for (actionmap, context, actions) in sorted(helplist, key=self._sortHeadingsAlpha):
 			amId = actMapId()
 			if headings and amId in actionMapHelp:
 				if sortKey:
 					actionMapHelp[amId].sort(key=sortKey)
 				self.addListBoxContext(actionMapHelp[amId], formatFlags)
 
-				l.append((None, actionmap.description or _(re.sub(r"(\w)([A-Z])([a-z])", r"\1 \2\3", context)), None) + extendedPadding)
+				if getattr(actionmap, "description", None):
+					l.append((None, actionmap.description, None) + extendedPadding)
+				else:
+					if context not in groups:
+						groups.append(context)
+						l.append((None, _(re.sub(r"(\w)([A-Z])([a-z])", r"\1 \2\3", context)), None) + extendedPadding)
 				l.extend(actionMapHelp[amId])
 				del actionMapHelp[amId]