patch 9.1.1084: Unable to persistently ignore events in a window and its buffers

Problem:  Unable to persistently ignore events in a window and its buffers.
Solution: Add 'eventignorewin' option to ignore events in a window and buffer
          (Luuk van Baal)

Add the window-local 'eventignorewin' option that is analogous to
'eventignore', but applies to a certain window and its buffers. Identify
events that should be allowed in 'eventignorewin', adapt "auto_event"
and "event_tab" to encode this information. Window context is not passed
onto apply_autocmds_group(), and when to ignore an event is a bit
ambiguous when "buf" is not "curbuf", rather than a large refactor, only
ignore an event when all windows into "buf" are ignoring the event.

closes: #16530

Signed-off-by: Luuk van Baal <luukvbaal@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/runtime/doc/autocmd.txt b/runtime/doc/autocmd.txt
index 8a653f2..a8f1b8b 100644
--- a/runtime/doc/autocmd.txt
+++ b/runtime/doc/autocmd.txt
@@ -1,4 +1,4 @@
-*autocmd.txt*   For Vim version 9.1.  Last change: 2024 Dec 04
+*autocmd.txt*   For Vim version 9.1.  Last change: 2025 Feb 08
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -1992,6 +1992,9 @@
 this may cause unexpected behavior, make sure you restore 'eventignore'
 afterwards, using a |:try| block with |:finally|.
 
+To disable autocmds indefinitely in a specific window use the 'eventignorewin'
+option.  This can only be used to ignore window and buffer related events.
+
 							*:noautocmd* *:noa*
 To disable autocommands for just one command use the ":noautocmd" command
 modifier.  This will set 'eventignore' to "all" for the duration of the