vim-patch:8.2.3384: cannot disable modeline for an individual file

Problem:    Cannot disable modeline for an individual file.
Solution:   Recognize "nomodeline" in a modeline. (Hu Jialun, closes vim/vim#8798)
https://github.com/vim/vim/commit/9dcd349ca85e1df1abd1cbf1c29c0f1574b70bf8

Cherry-pick missing modeline for test_modeline.vim (heh) from v8.2.1432.

1 files changed, 9 insertions, 0 deletions

diff --git a/runtime/doc/options.txt b/runtime/doc/options.txt
index 90ba3b86d9..1a703129d6 100644
--- a/runtime/doc/options.txt
+++ b/runtime/doc/options.txt
@@ -435,6 +435,15 @@ chance that a normal word like "lex:" is caught.  There is one exception:
 version 3.0).  Using "ex:" at the start of the line will be ignored (this
 could be short for "example:").
 
+If the modeline is disabled within a modeline, subsequent modelines will be
+ignored.  This is to allow turning off modeline on a per-file basis.  This is
+useful when a line looks like a modeline but isn't.  For example, it would be
+good to start a YAML file containing strings like "vim:" with
+    # vim: nomodeline ~
+so as to avoid modeline misdetection.  Following options on the same line
+after modeline deactivation, if any, are still evaluated (but you would
+normally not have any).
+
 							*modeline-local*
 The options are set like with ":setlocal": The new value only applies to the
 buffer and window that contain the file.  Although it's possible to set global