Page or Control modifications don't cause Recompilation

[simonegli8]

Describe the bug
Normally, if a aspx or ascx page is modified, the change should be visible in the page instantly, and the corresponding page should be recompiled. WebFormsForCore does not recompile the page tough, only when the app pool is restarted. The reason is that the original implementation uses a Windows dependant file system watcher and not the .NET FileSystemWatcher, so it has been disabled, because it does not work on Linux. But this could be implemented, altough the FileSystemWatcher implementation on Linux has severe limitations.

To Reproduce
Steps to reproduce the behavior:

1. Create an aspx page and view it in the browser.
2. Modify the content of the aspx page in an editor.
3. Reload the page in the browser.
4. You should see the changes applied, but WebFormsForCore still displays the old content.

Expected behavior
Modifications to aspx or ascx should be visible instantly.

[simonegli8]

Microsoft is about to fix the issues with FileSystemWatcher on Linux, so we can implement this feature with FileSystemWatcher for .NET 10