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commit 62e71f4e1bd113b0dd7582bfe5d56667581ab2f9
Author: [email protected] <[email protected]>
AuthorDate: Wed Mar 18 21:30:10 2026 -0600
fix: read active screen buffer in _flush_screen_to_shm
The function was incorrectly checking ty->altbuf to select which
buffer to read. However, termpty_screen_swap() already swaps the
screen/screen2 pointers themselves, so ty->screen is always the
currently-active display buffer regardless of altbuf state. The
altbuf branch was reading the stale primary buffer instead of the
active alternate buffer, causing fullscreen applications (htop, vim,
less, etc.) to appear blank in session mode.
Fixes blank content in fullscreen apps when using tymux sessions.
---
src/bin/tymux_session.c | 20 +++++++++-----------
1 file changed, 9 insertions(+), 11 deletions(-)
diff --git a/src/bin/tymux_session.c b/src/bin/tymux_session.c
index 873a59e9..82c8b57b 100644
--- a/src/bin/tymux_session.c
+++ b/src/bin/tymux_session.c
@@ -93,17 +93,15 @@ _flush_screen_to_shm(TermDSession *sess)
Termcell *scr;
int circ_off;
- /* Select primary or alternate screen buffer */
- if (ty->altbuf)
- {
- scr = ty->screen2;
- circ_off = ty->circular_offset2;
- }
- else
- {
- scr = ty->screen;
- circ_off = ty->circular_offset;
- }
+ /* Always read from ty->screen / ty->circular_offset.
+ * termpty_screen_swap() swaps the screen pointers themselves, so
+ * ty->screen is always the currently-active buffer regardless of
+ * whether the alternate screen is in use (ty->altbuf). Reading
+ * ty->screen2 when altbuf==1 would return the stale primary
+ * buffer, causing fullscreen apps (htop, vim, less …) to appear
+ * blank in session mode. */
+ scr = ty->screen;
+ circ_off = ty->circular_offset;
/* Clamp to shm capacity */
cols = (w < (int)TERMSRV_MAX_COLS) ? w : (int)TERMSRV_MAX_COLS;
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