Donut caching breaks functions using C1PageRoute.RegisterPathInfoUsage();

[napernik]

1. Use Composite.News package
2. In a layout, have one function that has PreventFunctionOutputCaching set to true

public override bool PreventFunctionOutputCaching { get { return true; } }

3. Add a news page
4. Visit the news page in incognito mode, (so there's no logged in user and the caching isn't disabled)
5. Refresh the page a few times

Expected:

The page is shown

Actual:

The page is shown only on the first visit, and 404 response is shown afterwards

Explanation:

Donut caching feature caches the output of the Composite.News.NewsList function, but doesn't caches the fact that C1PageRoute.RegisterPathInfoUsage(); should be invoked as well.

Workaround:

Add the following line to the affected function:

public override bool PreventFunctionOutputCaching { get { return true; } }