Comment 10 for bug 1675825

Lines can most certainly overlap.

screen recording:
https://www.dropbox.com/s/dflteowidv3eftl/2017-12-18_15-07-19.gif?dl=0
(No need to sign-up for db, just dismiss any popups.)

Note the button for outer element is active.

Maybe you have seen these notes:
http://wiki.inkscape.org/wiki/index.php/Release_notes/0.92#Line_Spacing

TD