feat(telescope): support live preview of currently selected colorscheme

[Cyberczy]

When I use fc to switch colorschemes,I can't see the change in real time.
So I made some changes

[Cyberczy]

before.mp4

[Cyberczy]

after.mp4

[ayamir]

In fact, alpha.lua is also needed to change.

[Cyberczy]

事实上，alpha.lua也是需要改变的。

yup, I had that problem too,and I'll try to fix it later

[CharlesChiuGit]

nice work!

[Cyberczy]

In fact, alpha.lua is also needed to change.

I made the same change in alpha.lua, but it didn't work

[Cyberczy]

In fact, alpha.lua is also needed to change.

I made the same change in alpha.lua, but it didn't work

it.didn.t.work.mp4

[CharlesChiuGit]

I change the lazy event of telescope.nvim to BufWinEnter, but it also wont change the colorscheme in realtime.

I also went dig some docs about alpha.nvim and telescope.nvim, can't find any useful info tho.

[Cyberczy]

I change the lazy event of telescope.nvim to BufWinEnter, but it also wont change the colorscheme in realtime.

I also went dig some docs about alpha.nvim and telescope.nvim, can't find any useful info tho.

I had the same problem when using nvim-tree

[Cyberczy]

2023-11-30.16-38-53.mp4

In this video, you can clearly see that the README.md file works properly, but the nvim-tree file does not

[CharlesChiuGit]

i think it's about special filetype, for example, alpha's bufer filetype is alpha and nvim-tree's bufer filetype is NvimTree.

[Cyberczy]

yup, but I'm running out of ideas

[CharlesChiuGit]

https://github.com/nvim-telescope/telescope.nvim/blob/84c5a71d825b6687a55aed6f41e98b92fd8e5454/lua/telescope/builtin/__internal.lua#L974-L1019

it seems the cause of the issue.

[Jint-lzxy]

I made the same change in alpha.lua, but it didn't work

AFAIU this is the expected behavior under the current implementation. Since these buffers aren't included in the listed buffer list, there's no simple way to open such a buffer in another window, and setting the current colorscheme to itself in those buffers (e.g, running :colorscheme catppuccin again when the current colorscheme is already catppuccin) is usually not supported across implementations. And this is also the behavior when Telescope is first opened (because the caret defaults to point to the current active colorscheme.) The following one-liner intuitively demonstrates this:

nvim unlisted_buffer "+set nobuflisted | Telescope colorscheme enable_preview=true"

So I'm kinda on the fence about whether to include this patch in our defaults, because it doesn't work as expected in some (rather common) use cases.

[Cyberczy]

So I'm kinda on the fence about whether to include this patch in our defaults, because it doesn't work as expected in some (rather common) use cases.

Thank you no matter what

[ayamir]

I tend to merge it and add the exception situations to wiki.

[CharlesChiuGit]

I think this is gd enough too. agree with ayamir

[Jint-lzxy]

Agree with this too lol @Cyberczy thanks for the great work here!