I've tracked down the issue and it's related to incorrect handling of zero-width combining characters. See https://savannah.gnu.org/bugs/index.php?68712 for details.
On Wed, Sep 23, 2026, at 8:42 AM, Kevin Hovsäter wrote: > I recently switched from tmux to GNU screen and overall it's been a rather > nice experience. With that said, I'm running into an issue with vertical > splits. Whenever I use a vertical split and scroll some contents in one of > the region, the contents leak into the other split. Sometimes it not only > leaks into the other split, but the rendering corrupts the terminal > altogether and I'm forced to run C-a l to redraw the entire screen. Initially > I thought it was a single program that caused this issues but later I've seen > the same problem with just piping input to less, e.g., `git log | less`. > > Have anyone else run into this? Any help would be much appreciated.
