Truncate long inlay hints

[mjbvz]

Problem

See microsoft/TypeScript#56541

TypeScript's inlay hints can be rather long. Previously we truncate these inlay hints at 30 characters. However we disabled this truncation when adding support for interactive inlay hints

While discussing this problem with the TS team, we realized that it would likely make more sense for VS Code to control the truncation instead of leaving it up to individual languages/extensions. That way the user experience is more consistent and an extension can't break us by sending extremely long inlay hints

The Rust extension also currently has logic to truncate their inlay hints

Proposal

Add a default length limit to inlay hints. We could also add a setting that let's users control this limit

In addition, perhaps we can provide a way to view the full hint if you really want to. Either showing it in on hover or in a tooltip

[mjbvz]

/cc @MariaSolOs

[iambpn]

with the new TS interactive change this is much needed feature. I m working with mongoose and when enabling inlay hints, it pushes reamining code in same line to next line.

Here is one example of it:

I think another possible way to solve this is to, truncate inlay hints to 30 characters by default and when ctrl + hover on inlay hints it expands to show full inlay hints and can interact with it. Also by default ctrl + click is the default way to go to definition.

[AlbertMarashi]

Yerr this is pretty annoying

[jrieken]

#201190 adds a first version for this. This is a bit ham-fisted and limits inlays to 43 character per line. This can be further improved by

• make the limit dynamic to the view port width
• taking the line contents into account (e.g have a dynamic limit and allow to fill up the view port horizontally)
• honour the different label parts and do truncation within them