vim: make editing .vim files with indentLine less painful
vim: make editing .vim files with indentLine less painful

This is a problem because of the use of 'conceal' in docvim comments.
Without this, even in insert mode we can't see the markup. With this, we
see the markup, at the cost of losing the indentLine markers on the
current line in insert mode.

wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent,wincent/wincent