How can I keep the gutter width constant when using YouCompleteMe?

Question

YouCompleteMe puts symbols in the "gutter" (left of the editor) for errors:

The problem is that the gutter shifts the whole editor over, and it is only present when there is at least one error. Compare:

Short of always writing code with at least one error, how can I keep the width constant?

Answer 1

Install Vim 8 (released a few hours ago), and set signcolumn:

set signcolumn=yes

This is a actually available in Vim 7.4.2201 and later, but you really should go for the major release instead.