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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".
This commit is contained in:
Peter Hofmann 2023-10-07 07:40:07 +02:00 committed by Hiltjo Posthuma
parent a6bbc0c96b
commit 2fc7e532b2
1 changed files with 1 additions and 1 deletions
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st.c
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@ -1097,7 +1097,7 @@ tscrollup(int orig, int n)
void void
selscroll(int orig, int n) selscroll(int orig, int n)
{ {
if (sel.ob.x == -1) if (sel.ob.x == -1 || sel.alt != IS_SET(MODE_ALTSCREEN))
return; return;
if (BETWEEN(sel.nb.y, orig, term.bot) != BETWEEN(sel.ne.y, orig, term.bot)) { if (BETWEEN(sel.nb.y, orig, term.bot) != BETWEEN(sel.ne.y, orig, term.bot)) {