Feat: Delay updating lualine to prevent flickering

[savchenko]

Requested feature

Allow "delaying" an update to prevent flicker when rapidly changing modes:

https://github.com/nvim-lualine/lualine.nvim/assets/300146/f4089705-46c7-4523-a82a-73598641cde7

Motivation

User has a hotkey:

map('n', '<Tab>', ':call NextFile()<cr>', remap_silent('Next buff|tab'))

It works as expected, however when executing the command, lualine briefly flickers from Normal to Command and then back to Normal.

It is "as expected" behaviour, but nevertheless annoying.

[Sam-programs]

:help <cmd> Should be used to prevent this from happening,

Also the fzfx issue isn't about mapping/mode changes, If you open a tabpage with lualine the whole statusline disappears sometimes. I think this is because lualine doesn't load the window's statusline in the time a tabpage opens. Try refreshing it when the tab is opened.

vim.api.nvim_create_autocmd("TabNewEntered",{
    pattern = "*",
    callback = function(opts)
        require('lualine').refresh()
    end,
})

This should fix the flicker, However adding this to lualine is gonna be difficult/ugly, Because in lualine the autocmd updates are scheduled via vim.schedule,But this one needs to be refreshed right away.

[savchenko]

@Sam-programs,

:help Should be used to prevent this from happening,

What do you mean?

[Sam-programs]

Use <cmd> instead of : to stop the flickering in the mapping. :help <cmd> :

The <Cmd> pseudokey begins a "command mapping", which executes the command
directly without changing modes.  Where you might use ":...<CR>" in the
{rhs} of a mapping, you can instead use "<Cmd>...<CR>".

Since it doesn't change modes lualine doesn't flicker.