hydra hint does not work with neovim 0.12 new feature: `vim._extui`

[aidancz]

for example:

require("vim._extui").enable({
})

require("hydra").setup({
})

require("hydra")({
	body = "z",
	heads = {
		{"h", "5zh"},
		{"l", "5zl"},
	},
})

No hint is shown until Hydra becomes inactive

[benlubas]

Thank you for documenting this. I hope you'll understand that a nightly feature still hidden behind an _ name is not going to get much attention (from me) until it's more stable. I'd welcome a PR though!