[BUG] Hook Insert/NormalIdle not executing command until first keypress

[sdothum]

Version of Kakoune

v2023.08.05

Reproducer

Nothing complicated..

```

hook global WinCreate .* %{
normal-mode-colorscheme
hook window ModeChange (push|pop):.:insert insert-mode-colorscheme
hook window ModeChange (push|pop):insert:. normal-mode-colorscheme
hook window InsertIdle .* capslock-check
hook window NormalIdle .* capslock-check
}

capslock-check checks the capslock status and sets the colorscheme to the capslock scheme if on (and reverts back to the correct modal theme if off).


### Outcome

The appropriate theme is toggled on enabling the capslock. The capslock state (configured) is shown immediately on the statusline BUT the appropriate colorscheme does not show until the first keypress subsequent to togging the capslock key.

### Expectations

Expecting the hook to immediately effect the colorscheme change of capslock state.

### Additional information

I inserted a %sh{echo "capslocks on" >>/tmp/kak:trace} statement into the capslock-check command hook and, indeed, togging the capslock does not issue the trace message until the first keypress after toggling the capslock. It's as if the hook action is queued and doesn't trigger until the keypress.

This happens with no plugins loaded as well. Running on Alpine Linux 3.19 (latest stable).