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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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15
format.c
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@@ -1947,6 +1947,18 @@ format_cb_origin_flag(struct format_tree *ft)
return (NULL);
}
/* Callback for synchronized_output_flag. */
static void *
format_cb_synchronized_output_flag(struct format_tree *ft)
{
if (ft->wp != NULL) {
if (ft->wp->base.mode & MODE_SYNC)
return (xstrdup("1"));
return (xstrdup("0"));
}
return (NULL);
}
/* Callback for pane_active. */
static void *
format_cb_pane_active(struct format_tree *ft)
@@ -3439,6 +3451,9 @@ static const struct format_table_entry format_table[] = {
{ "start_time", FORMAT_TABLE_TIME,
format_cb_start_time
},
{ "synchronized_output_flag", FORMAT_TABLE_STRING,
format_cb_synchronized_output_flag
},
{ "tree_mode_format", FORMAT_TABLE_STRING,
format_cb_tree_mode_format
},