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Add support for applications to use synchronized output mode (DECSET

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2026) to prevent screen tearing during rapid updates. When an
application sends SM ?2026, tmux buffers output until RM ?2026 is received
or a 1-second timeout expires.

From Chris Lloyd with the assistance of Claude Code, GitHub issue 4744.
This commit is contained in:
nicm
2025-12-17 11:49:29 +00:00
parent ce7eb22e3a
commit 1c7e164c22
7 changed files with 87 additions and 1 deletions
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10
input.c
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@@ -898,6 +898,8 @@ input_free(struct input_ctx *ictx)
evbuffer_free(ictx->since_ground);
event_del(&ictx->ground_timer);
screen_write_stop_sync(ictx->wp);
free(ictx);
}
@@ -1897,6 +1899,11 @@ input_csi_dispatch_rm_private(struct input_ctx *ictx)
case 2031:
screen_write_mode_clear(sctx, MODE_THEME_UPDATES);
break;
case 2026: /* synchronized output */
screen_write_stop_sync(ictx->wp);
if (ictx->wp != NULL)
ictx->wp->flags |= PANE_REDRAW;
break;
default:
log_debug("%s: unknown '%c'", __func__, ictx->ch);
break;
@@ -1995,6 +2002,9 @@ input_csi_dispatch_sm_private(struct input_ctx *ictx)
case 2031:
screen_write_mode_set(sctx, MODE_THEME_UPDATES);
break;
case 2026: /* synchronized output */
screen_write_start_sync(ictx->wp);
break;
default:
log_debug("%s: unknown '%c'", __func__, ictx->ch);
break;