From 2fc7e532b23e2f820c6b73d352ec7c41fefa45b5 Mon Sep 17 00:00:00 2001
From: Peter Hofmann <scm@uninformativ.de>
Date: Sat, 7 Oct 2023 07:40:07 +0200
Subject: [PATCH] Don't scroll selection on the other screen
Fixes garbage selections when switching to/from the alternate screen.
How to reproduce:
- Be in primary screen.
- Select something.
- Run this (switches to alternate screen, positions the cursor at the
bottom, triggers selscroll(), and then goes back to primary screen):
tput smcup; tput cup $(tput lines) 0; echo foo; tput rmcup
- Notice how the (visual) selection now covers a different line.
The reason is that selscroll() calls selnormalize() and that cannot find
the original range anymore. It's all empty lines now, so it snaps to
"select the whole line".
---
st.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/st.c b/st.c
index 623376e..3d250dd 100644
--- a/st.c
+++ b/st.c
@@ -1097,7 +1097,7 @@ tscrollup(int orig, int n)
void
selscroll(int orig, int n)
{
- if (sel.ob.x == -1)
+ if (sel.ob.x == -1 || sel.alt != IS_SET(MODE_ALTSCREEN))
return;
if (BETWEEN(sel.nb.y, orig, term.bot) != BETWEEN(sel.ne.y, orig, term.bot)) {