feature: add symbol in tab when there are not saved changes on file.

[sergiornelas]

Hello, would be amazing if the user has an edited non-saved file, then shows a symbol in the respective tab and window.
Thanks.

[sergiornelas]

Checking the docs, that requested feature is available.
In order to implement this (just for reference):

local modified_symbol = "[x]"

local function buf_modified(buf)
	if vim.bo[buf].modified then
		return modified_symbol
	else
		return ""
	end
end

local function tab_modified(tab)
	local wins = require("tabby.module.api").get_tab_wins(tab)
	for _, x in pairs(wins) do
		if vim.bo[vim.api.nvim_win_get_buf(x)].modified then
			return modified_symbol
		end
	end
	return ""
end

-- ...
	line.wins_in_tab(line.api.get_current_tab()).foreach(function(win)
	         return {
			-- ...
			buf_modified(win.buf().id),
                         -- ...
		}
	end),
        -- ...
	line.tabs().foreach(function(tab)
		return {
			-- ...
			tab_modified(tab.id),
                         -- ...
		}
	end),