fix: correctly complete macro call if cursor at !

[unexge]

Fixes #9904

[Veykril]

Hmm, so this is actuall tricky. I see the problem now, when requesting completions for foo!$0($0 being the cursor), we insert our dummy token after the bang. Our infra technically handles this completion as something completely different from the foo! call since foo! itself is not a mere ident.

So your fix here might work for this specific case but its actually not really correct. I'm not quite sure what we can do here either though 🤔

[matklad]

Seems to be a tough nut to crack! I'd expect us to

• add is_immediately_after_macro_bang condition to completion context
• handle this as a special case in the renderer

[unexge]

Updated according to reviews

[Veykril]

bors r+

[bors]

Build succeeded:

• Rust (macos-latest)
• Rust (ubuntu-latest)
• Rust (windows-latest)
• TypeScript (ubuntu-latest)
• TypeScript (windows-latest)