Subject: 26.1; mouse-save-then-kill does not kill rectangles

From: [email-masked] (Charles A. Roelli)
Date: Sun, 22 Apr 2018 20:35:02 +0200

>From emacs -Q:

C-x SPC
mouse-3 on the space after ";; This"
mouse-3 again on the same spot

You're left with just ";; This".  It looks like the region is being
killed as a normal region (between point and mark) instead of as a
rectangle.