patch 8.1.1160: termcodes test would fail in a very big terminal

Problem:    Termcodes test would fail in a very big terminal.
Solution:   Bail out when the row is larger than what will work. (Dominique
            Pelle, closes #4246)
diff --git a/src/testdir/test_termcodes.vim b/src/testdir/test_termcodes.vim
index 633e021..949fa94 100644
--- a/src/testdir/test_termcodes.vim
+++ b/src/testdir/test_termcodes.vim
@@ -118,6 +118,12 @@
     let rowseparator = winheight(0) + 1
     let row = rowseparator
     let col = 1
+
+    if ttymouse_val ==# 'xterm' && row > 223
+      " When 'ttymouse' is 'xterm', row/col bigger than 223 are not supported.
+      continue
+    endif
+
     call MouseLeftClick(row, col)
 
     let row -= 1
@@ -168,6 +174,12 @@
     let rowstatusline = winheight(0) + 1
     let row = rowstatusline
     let col = 1
+
+    if ttymouse_val ==# 'xterm' && row > 223
+      " When 'ttymouse' is 'xterm', row/col bigger than 223 are not supported.
+      continue
+    endif
+
     call MouseLeftClick(row, col)
     let row -= 1
     call MouseLeftDrag(row, col)
diff --git a/src/version.c b/src/version.c
index 46341ee..81f0420 100644
--- a/src/version.c
+++ b/src/version.c
@@ -772,6 +772,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1160,
+/**/
     1159,
 /**/
     1158,