EnableDefaultApplicationDefinition to false prevents Page's from working

[clairernovotny]

• .NET Core Version: (e.g. 3.0 Preview1, or daily build number, use dotnet --info) 3.0 preview 8

Problem description:

If you set EnableDefaultApplicationDefinition to false, the other page XAML items get set to None instead of Page.

Actual behavior:

Expected behavior:
Page items should still be working

Minimal repro:

New WPF app, add a page.

Set EnableDefaultApplicationDefinition to false.

[rladuca]

Thanks for reporting this @onovotny ! This was a regression from a prior change to support Visual Studio's reading of None items (see #685).

This fix was merged in both master and release/3.0 branches.