Some tag helper are not in the completion list when available

[DoctorKrolic]

Version used: VS 2022 v17.3 Preview 2

To reproduce:

1. Create "ASP.NET Core Web App"
2. Go to Index.cshtml page
3. Start typing <fo

Expected behavior: There is a form tag helper completion in the list, because as soon as you write it, it becoms colorized as a tag helper:

Actual behavior: There is only html tag completion

Demo:

Additional context: Compare to the same case for script tag for clarity:

I would like from to work the same (kind of, see https://github.com/dotnet/razor-tooling/issues/6584). Also form is no the only one with this problem. For instance, here is link in _Layout.cshtml: As you clearly see, it can be a tag helper in this context

[ryanbrandenburg]

This is going to require some discussions on our end about expected behaviors and how to achieve that.

[davidwengier]

This is interesting, and looking at the code as written, the expectation here would be the script doesn't show up in completion. It's showing up because we happen to see the UrlResolutionTagHelper before we see the ScriptTagHelper. Current completion implementation doesn't show tag helpers in completion if they don't have a capital letter.

It feels to me like that behaviour is correct, and the bug is that UrlResolutionTagHelper shouldn't be impacting completion at all, but there could be a custom element scenario that would break if we did that.

Thinking about this and https://github.com/dotnet/razor-tooling/issues/6768 it seems like there are some issues around completion that need to be re-designed, around ordering, and dealing with tag helpers that have rules about other tag names.

[davidwengier]

So in a way this will be fixed by https://github.com/dotnet/razor-tooling/pull/6823 in that the form tag helper will be shown in completion.

In an entirely other way though, thats a bug.