From c90223e4c8ada793411cd30279e8a60ab401ee36 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Wed, 6 Dec 2017 00:31:03 +0530
Subject: [PATCH] Report unknown CSI r sequences

---
 kitty/control-codes.h | 5 -----
 kitty/parser.c        | 9 +++++++--
 2 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/kitty/control-codes.h b/kitty/control-codes.h
index 8acd797c0..23ee94ba1 100644
--- a/kitty/control-codes.h
+++ b/kitty/control-codes.h
@@ -221,11 +221,6 @@
 // Soft reset
 #define DECSTR 'p'
 
-// *Select top and bottom margins*: Selects margins, defining the
-// scrolling region; parameters are top and bottom line. If called
-// without any arguments, whole screen is used.
-#define DECSTBM 'r'
-
 // *Horizontal position adjust*: Same as :data:`CHA`.
 #define HPA '`'
 
diff --git a/kitty/parser.c b/kitty/parser.c
index 03ce1829c..6be325bfe 100644
--- a/kitty/parser.c
+++ b/kitty/parser.c
@@ -649,8 +649,13 @@ dispatch_csi(Screen *screen, PyObject DUMP_UNUSED *dump_callback) {
             CALL_CSI_HANDLER1P(save_cursor, 0, '?'); 
         case RC: 
             CALL_CSI_HANDLER1P(restore_cursor, 0, '?'); 
-        case DECSTBM: 
-            CALL_CSI_HANDLER2(screen_set_margins, 0, 0); 
+        case 'r': 
+            if (!start_modifier && !end_modifier) {
+                // DECSTBM
+                CALL_CSI_HANDLER2(screen_set_margins, 0, 0); 
+            }
+            REPORT_ERROR("Unknown CSI r sequence with start and end modifiers: '%c' '%c'", start_modifier, end_modifier);
+            break;
         case DECSCUSR: 
             CALL_CSI_HANDLER1M(screen_set_cursor, 1); 
         case SU: