The following is from vim-sensible plugin:
set incsearch " Use <C-L> to clear the highlighting of :set hlsearch. if maparg('<C-L>', 'n') ==# '' nnoremap <silent> <C-L> :nohlsearch<C-R>=has('diff')?'<Bar>diffupdate':''<CR><CR><C-L> endif
As far as I know,
==# is "always case-sensitive" operator. But what is the purpose to use it when we are compare something to empty string?
And also, what does the entire
if maparg('<C-L>', 'n') ==# '' line mean?