fix(bufferline): prevent tabline pop-(in/out)

[baod-rate]

bufferline.nvim updates the showtabline option in its setup(), so if showtabline is set to a conflicting value prior to loading bufferline, the user will see it flash in/out as the UI loads. Change the event that loads the plugin from VeryLazy to UIEnter to avoid this

e.g. set vim.opt.showtabline = 2 in lua/config/options.lua and then open a single file. The tabline will display but only for less than a second

[dpetka2001]

Can this not be avoided if the user correctly uses the always_show_bufferline option? I also had this problem in the past and found out that if a user is using bufferline, then he should use always_show_bufferline option instead of setting showtabline. Even if you have showtabline = 2 it doesn't really do anything if always_show_bufferline isn't set to true.

[baod-rate]

That is only one of the cases. for ex ,if you set always_show_bufferline = true (and keep the default showtabline = 1) the bufferline will pop-in when you open a file. even if you use a completely unmodified LazyVim with default settings, the pop-in still happens if you open two buffers on startup, e.g. nvim file1 file2

[dpetka2001]

Yes, that happens because VeryLazy happens after UIEnter when the TUI is ready. My concern was there might be some kind of performance hit, but I've tried it and I didn't observe anything meaningful to the human eye. I actually like this behavior better, because on VeryLazy it looks like some kind of a glitch, whereas your proposal makes it look more natural.

Here's hoping that the maintainer will also be positive of this change 😄

[folke]

Not a fan of this. Thank you anyway. Closing.