Automatically add | when using multiline strings

[tgodzik]

I finally got annoyed when adding new tests and came up with a working(?) solution for automatically adding |

This will not break when using | as an operator since we require either only \s before or """| and we can't get just the operator without anything on the left.

The only problem I have is when doing enter after """| indentation doesn't go all the way up to where it should. Any ideas? Thoughts?

There are two formatting changes that came up probably because I installed prettifier.

Side note: I learned to make GIFs! Was actually pretty easy :D

[gabro]

I think this is a nice improvement and I propose we merge it as is.
We can work around the first newline issue in a separate PR.

[olafurpg]

I absolutely agree that editing multiline strings is a big pain in VS Code. It's one of the things I miss the most from IntelliJ.

I'm am concerned the solution in this PR is quite fragile however:

• it triggers even when editing outside of string literals
• it doesn't handle copy-pasted code
• it only works with VS Code

I'm OK with keeping this change since it does solve the biggest pain point. I opened a followup ticket with more details on how I believe it's possible to solve this problem more robustly via LSP.