Rewrite the tabs of an address only where it ends in ';"'

Without the terminator nothing says which tab belongs to the pattern and which
separates a column, so a tag command that adds columns without one had its
address merged with them and refused.

autoload/fzf/vim.vim

@@ -1655,9 +1655,11 @@ endfunction
 " ------------------------------------------------------------------
 " ctags leaves a tab inside a pattern as it found it, and splitting the line on
 " tabs would cut the address short, leaving a fragment that matches some other
-" line. '\t' matches the same text and keeps the field the line's third
+" line. '\t' matches the same text and keeps the field the line's third. Only the
+" ';"' terminator says where the address ends, so a line without one is left as
+" it is rather than guessed at
 function! s:tabs_in_address(line)
-  return substitute(a:line, '^\%([^\t]*\t\)\{2}\zs.\{-}\ze\%(;"\t\|$\)',
+  return substitute(a:line, '^\%([^\t]*\t\)\{2}\zs.\{-}\ze;"\t',
         \ '\=substitute(submatch(0), "\t", ''\\t'', "g")', '')
 endfunction