From adc9b3f6cf7f1072f450855c4be3f8d767f70712 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Tue, 8 Apr 2025 09:15:31 +0530
Subject: [PATCH] When issuing a DECRPSS report for SGR use a leading 0

This matches historical DEC terminal behavior.
---
 kitty/screen.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/kitty/screen.c b/kitty/screen.c
index cc504b639..8cfc818bd 100644
--- a/kitty/screen.c
+++ b/kitty/screen.c
@@ -2994,7 +2994,9 @@ screen_request_capabilities(Screen *self, char c, const char *query) {
                 shape = snprintf(buf, sizeof(buf), "1$r%d q", shape);
             } else if (strcmp("m", query) == 0) {
                 // SGR
-                shape = snprintf(buf, sizeof(buf), "1$r%sm", cursor_as_sgr(self->cursor));
+                const char *s = cursor_as_sgr(self->cursor);
+                if (s && s[0]) shape = snprintf(buf, sizeof(buf), "1$r0;%sm", s);
+                else shape = snprintf(buf, sizeof(buf), "1$r0m");
             } else if (strcmp("r", query) == 0) { // DECSTBM
                 shape = snprintf(buf, sizeof(buf), "1$r%u;%ur", self->margin_top + 1, self->margin_bottom + 1);
             } else if (strcmp("*x", query) == 0) { // DECSACE