[typescript] code folding take too long to be initialised

[aeschli]

• open a file from the vscode repo
• it takes a long time for the folding marker for imports to show up
• it seems the folding provider is only added once the typescript server is up and has analyzed the project (my guess).

As folding ranges only require looking at single file and doesn't involve resolving code, it would be great if folding range requests are handled without delay.

[mjbvz]

This is a consequence of the tsserver being single threaded. Even if we queue up the "get folding ranges" request right away, requests are only processed once tsserver has initialized and analyzed the project

However, it should only really take a very long time (~15sec) on vs code size projects. If it is taking long on normal projects, it's likely because the project is including unnecessary files by not having the correct include or exclude sets in the jsconfig or tsconfig

[aeschli]

I understand. What we would need is that the tsserver yields from time to time while initializing.

I've improved the behaviour on the editor side. If we open an editor right on restart and see that the last time we used a folding provider (e.g. from typescript) we wait up to 30 seconds for it to be registered again. That way we don't loose the previously collapsed regions.

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