vim-airline: what is “! trailing[1]”
That means you have a trailing whitespace on the first line ([1]). You can add to your .vimrc the following: set list ” Display unprintable characters f12 – switches set listchars=tab:•\ ,trail:•,extends:»,precedes:« ” Unprintable chars mapping That’ll display whitespace chars. You can toggle it with :set invlist.