some completion doesn't work in Column Selection Mo

[CGMossa]

rust-analyzer version: rust-analyzer version: 0.4.1305-standalone (398a71a 2022-11-29)

rustc version: rustc 1.67.0-nightly (c090c6880 2022-12-01)

Using .some completion in VSCode doesn't work when you're in Column Selection Mode.
Here is a screenshot:

Note that the completion does work if done on individual lines.

[jonas-schievink]

Approximately nothing works if you have multiple cursors, but I think that's often a VS Code bug or LSP limitation

[flodiebold]

Duplicate of #11841, though it's questionable whether there's anything to do for us.