how would we distinguish whether this is a bug in less generally vs just in tumbleweed?
and do other tumbleweeds see the same bug? i see it here and there but with luck perhaps this manifestation will reproduce for you: open an id_rsa.pub file in less, for me
When you report a problem, make at least some minimal efforts to describe it so that others can also reproduce it or at least understand what the problem is about. Do you seriously believe that everyone has id_rsa.pub file (and you did not tell in which directory) or that everyone is using exactly the same less settings (because issue happens only when long lines are not folded)? Besides, users may have large display where even id_rsa.pub fits the screen.
Anyway, the problem is likely fixed in the current upstream starting with v645.
commit b975ca250c51ef25b403c82667996dab59904049
Author: Mark Nudelman <markn (at) greenwoodsoftware.com>
Date: Mon Sep 18 17:33:01 2023 -0700
Fix bug in rrshift (ESC-}) when beginning of file is
scrolled down, so that position(TOP)==NULL_POSITION.