Prevent smuggling in a grep option

irclog.py

@@ -1078,6 +1078,7 @@ class WebServer:
 		]
 		if 'casesensitive' not in request.query:
 			cmd.append('--ignore-case')
+		cmd.append('--')
 		cmd.append(request.query['q'])
 		for path in itertools.chain((request.match_info['path'],), self._paths[request.match_info['path']][3]):
 			cmd.append(os.path.join(self.config['storage']['path'], path, ''))