patch 9.0.1326: relative line number not updated with virtual text above

Problem:    Relative line number not updated with virtual text above.
Solution:   Adjust the row for the line number for virtual text above.
            (closes #12004)
diff --git a/src/testdir/test_textprop.vim b/src/testdir/test_textprop.vim
index 158896f..3bd08fe 100644
--- a/src/testdir/test_textprop.vim
+++ b/src/testdir/test_textprop.vim
@@ -2806,6 +2806,14 @@
   call term_sendkeys(buf, ":\<CR>")
   call VerifyScreenDump(buf, 'Test_prop_above_below_empty_3', {})
 
+  call term_sendkeys(buf, ":set colorcolumn=\<CR>")
+  call term_sendkeys(buf, ":set relativenumber\<CR>")
+  call term_sendkeys(buf, ":\<CR>")
+  call VerifyScreenDump(buf, 'Test_prop_above_below_empty_4', {})
+
+  call term_sendkeys(buf, "kk")
+  call VerifyScreenDump(buf, 'Test_prop_above_below_empty_5', {})
+
   call StopVimInTerminal(buf)
 endfunc