vimrc: improve trailing whitespace matching

Make it work in windows beyond the first one.

1 files changed, 4 insertions, 1 deletions

diff --git a/vim/vimrc b/vim/vimrc
index 735e0e0..cf97de2 100644
--- a/vim/vimrc
+++ b/vim/vimrc
@@ -65,7 +65,10 @@ else
 endif
 
 " trailing whitespace highlighting
-match WhiteSpaceEOL /\s\+$/
+augroup vimrc
+   autocmd!
+   autocmd VimEnter,WinNew * call matchadd('WhiteSpaceEOL', '\s\+$')
+augroup END
 
 " extension-based filetypes
 let filetype_m="mma"