Function compoundChange

tools/pythonauto/static/codemirrorepl/codemirrorepl.js:2103–2106

(f)

        }

        function compoundChange(f) {
            history.startCompound();
            try { return f(); } finally { history.endCompound(); }
        }

        for (var ext in extensions)
            if (extensions.propertyIsEnumerable(ext) &&