Remove negative margins for group list items (#28940)
Remove negative margins for group list items (#28940)

To fix RGBA borders overlapping issue.
inway/bootstrap,twbs/bootstrap,zalog/bootstrap,coliff/bootstrap,coliff/bootstrap,stanwmusic/bootstrap,stanwmusic/bootstrap,inway/bootstrap,peterblazejewicz/bootstrap,peterblazejewicz/bootstrap,stanwmusic/bootstrap,GerHobbelt/bootstrap,zalog/bootstrap,peterblazejewicz/bootstrap,inway/bootstrap,tjkohli/bootstrap,m5o/bootstrap,m5o/bootstrap,GerHobbelt/bootstrap,stanwmusic/bootstrap,GerHobbelt/bootstrap,tjkohli/bootstrap,zalog/bootstrap,twbs/bootstrap