Only stack a new modal CBI map on top of the currently displayed modal one
if the related map or section differs. This prevents misbehavior when
switching the protocol of interfaces.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
(cherry picked from commit f2fa59e89af3d4bdae9b12471184425b307ad5d6)
b556cdf93e