From 0b4c9eddb5752d46b65d16e42230b1228f230f40 Mon Sep 17 00:00:00 2001
From: Bram Moolenaar <Bram@vim.org>
Date: Mon, 3 Jun 2019 22:04:23 +0200
Subject: [PATCH] patch 8.1.1458: crash when using gtags

Problem:    Crash when using gtags. (issue #4102)
Solution:   Check for negative row or col in screen_puts_len(). (Christian
            Brabandt)
---
 src/screen.c  | 6 +++++-
 src/version.c | 2 ++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/screen.c b/src/screen.c
index 37999bbf6b..53343e8c84 100644
--- a/src/screen.c
+++ b/src/screen.c
@@ -7707,7 +7707,11 @@ screen_puts_len(
     int		force_redraw_next = FALSE;
     int		need_redraw;
 
-    if (ScreenLines == NULL || row >= screen_Rows)	/* safety check */
+    // Safety check. The check for negative row and column is to fix issue
+    // #4102. TODO: find out why row/col could be negative.
+    if (ScreenLines == NULL
+	    || row >= screen_Rows || row < 0
+	    || col >= screen_Columns || col < 0)
 	return;
     off = LineOffset[row] + col;
 
diff --git a/src/version.c b/src/version.c
index f939ad8ca2..53a2644f94 100644
--- a/src/version.c
+++ b/src/version.c
@@ -767,6 +767,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1458,
 /**/
     1457,
 /**/