Consider the situation when current region defined by rl_mark and rl_point is of width zero
aka rl_mark == rl_point
@
readline$ some user input
^
Doing Cx Cx causes readline to highlight an active region. But the highlight goes further than expected (basically to the end of line).
Expected: nothing highlighted.
@
readline$ some user input
^
-------------------------
Actually: highlighting continues to the end of the line.
@
readline$ some user input
^
---------------==========
fixed by me, merged upstream
https://lists.gnu.org/archive/html/bug-readline/2026-07/msg00000.html https://lists.gnu.org/archive/html/bug-readline/2026-07/msg00001.html