feat: deduplicate progress messages

[j-hui]

Sometimes, an LSP server will start multiple tasks with the same message:

It makes no sense for Fidget to display all of them.

[gegoune]

An idea: instead of hiding duplicates a counter, similar to one in browser's dev tools, could be displayed:

(2x) Completed Building (and then bump x counter on each repetition). What do you think?

[j-hui]

I like the counter idea a lot! I'm wondering though, what mechanism should we use for deduplication?

At the moment, deduplication happens by key (which is the token accompanying each progress message); my initial thought was to add an option to the progress subsystem that allows that to be overridden, and use the message title as the key.

But what you're suggesting seems to be a feature on the notifications-side, which allows notifications with the same content to be deduplicated while rendering. That would allow other notifications to also be deduplicated, not just LSP progress notifications. But then we'd need to figure out what to use as the "hash" of each item for deduplication---maybe the message + annote contents will do?

Edit: Oops, fat-fingered the close button.

[mawkler]

I would love a deduplication feature as well. When using ltex-ls I get the notification "checking document" for every keypress in insert mode, and they quickly start stacking:

[mawkler]

Works great, thank you!