Essential control flow keywords are missing from completions (and randomly disappear/appear)

[Peter-Juhasz]

Version: VS 17.11.0 P2.1 (all extensions disabled)

Type switch, it is completely missing until you type it fully:

Rogzites.2024-07-02.154539.mp4

Type foreach, sometimes appears, sometimes disappears:

Rogzites.2024-07-02.154653.mp4

Type if, and get completed with IFormatProvider (happens the most frequently):

Rogzites.2024-07-02.155755.mp4

Similar to #10435 where items appear and disappear randomly, and you can also see the same symptoms as #9802 where completions selection bouncing and matching items randomly (maybe due to the list is being populated multiple times).

[davidwengier]

I think this is the same as #6927, in that when you start typing you're effectively typing in C# that looks like var _o = $$, so the switch keyword is indeed not valid there. Once you finish typing the keyword, the Razor compiler recognizes it, and generates code where it is valid. But definitely worth validating that, I'm not 100% sure if the compiler does recognize keywords like that.

[chsienki]

@davidwengier Is this a compiler or tooling issue?

[davidwengier]

This is tooling I believe.