bug#61412: Inlay activation

[Chinmay Dalal <dalal.chinmay.0101@gmail.com>]

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Eli Zaretskii <eliz@gnu.org> writes:

>> Cc: joaotavora@gmail.com
>> From: Chinmay Dalal <dalal.chinmay.0101@gmail.com>
>> Date: Wed, 15 Feb 2023 21:54:57 +0530
>> 
>> Regarding keybinding, on the github discussion someone suggested that
>> vscode shows them while a key combination is held and hides them when
>> they are released, but I was told emacs can't do this.
>
> Not only can we not do this, it is also not our style.  If we want to
> show hints, we either show tooltips, or display a message in the echo
> area.

Tooltips and echo area can't be used as inlay hints are for showing
types of multiple variables/expressions and names of parameters at once.

See the attached screenshots for an example (this is from my
implementation in this patch)


C++ (clangd):

[-- Attachment #2: clangd_inlay.png --]
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Rust (rust-analyzer):

[-- Attachment #4: ra_inlay.png --]
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