# HG changeset patch
# User Bram Moolenaar <Bram@vim.org>
# Date 1544185808 -3600
# Node ID ae25a1172514215c86757fbc58237ea78a465c7a
# Parent  71b114f291a85294df445e1849f942e8d3493d8b
patch 8.1.0567: error for NUL byte in ScreenLines goes unnoticed

commit https://github.com/vim/vim/commit/4087bfd96d0d70791a1572ac4b40d5a655e2166b
Author: Bram Moolenaar <Bram@vim.org>
Date:   Fri Dec 7 13:26:39 2018 +0100

    patch 8.1.0567: error for NUL byte in ScreenLines goes unnoticed

    Problem:    Error for NUL byte in ScreenLines goes unnoticed.
    Solution:   Add an internal error message.

diff --git a/src/gui.c b/src/gui.c
--- a/src/gui.c
+++ b/src/gui.c
@@ -2753,9 +2753,15 @@ gui_redraw_block(
 	}
 	else if (enc_utf8)
 	{
-	    // FIXME: how can the first character ever be zero?
-	    if (col1 > 0 && ScreenLines[off + col1] == 0)
-		--col1;
+	    if (ScreenLines[off + col1] == 0)
+	    {
+		if (col1 > 0)
+		    --col1;
+		else
+		    // FIXME: how can the first character ever be zero?
+		    IEMSGN("INTERNAL ERROR: NUL in ScreenLines in row %ld",
+								      gui.row);
+	    }
 # ifdef FEAT_GUI_GTK
 	    if (col2 + 1 < Columns && ScreenLines[off + col2 + 1] == 0)
 		++col2;
diff --git a/src/version.c b/src/version.c
--- a/src/version.c
+++ b/src/version.c
@@ -793,6 +793,8 @@ static char *(features[]) =
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    567,
+/**/
     566,
 /**/
     565,