Try the following without and with the patch, to see what this fixes:

% zmodload zsh/complist
% autoload compinit
% compinit
% bindkey '^I' menu-select
% ping -<TAB><TAB>
<Default selection highlight (reverse video) stops at the end of the match.>
% zstyle '*' list-colors 'ma=97;44'
% ping -<TAB><TAB>
<Without the patch, when changing selection, highlight continues until
end of line.>
<With the patch, it stops at the end of the match, just like the default.>