1. displays a very simplified tabline;
2. provides a toggle tabline mapping (F3);
3. provides auto-hide of tabline (after 2 seconds of visibility);

The tabline shows the number of the tab with additional "+" character in case one of the buffers in the tab has unsaved changes.

1. VIM 8+ (uses timer)
2. "set nocompatible" in .vimrc

Assuming there are 4 tabs, second and forth tabs with unsaved buffers and the second tab currently selected, the tabline will look like this

  1  [ 2+]  3    4+

Usually, tablines (standard or from other plugins) show the path of the buffer for the active window. This is fine as long as tabs are used with a single window.

But, when adding various number of splits per tab, this information becomes useless and takes too much space to display. The only real information that a tab with multiple windows can provide is it's number (to navigate quickly to it) and whether there are any unsaved modifications and this is what this plugin is all about.

Vundle
Plugin 'mihaicristiantanase/vim-mctab'

vim-plug
Plug 'mihaicristiantanase/vim-mctab'

Pathogen
git clone https://github.com/mihaicristiantanase/vim-mctab ~/.vim/bundle/vim-mctab