vim-patch:9.1.0207: No autocommand when writing session file (#28048)

Problem:  No autocommand when writing session file
Solution: Add SessionWritePost autocommand
          (Colin Kennedy)

fixes: vim/vim#14242
closes: vim/vim#14288

e5f2280381

Co-authored-by: Colin Kennedy <colinvfx@gmail.com>

src/nvim/auevents.lua

@@ -88,6 +88,7 @@ return {
     'SafeState', -- going to wait for a character
     'SearchWrapped', -- after the search wrapped around
     'SessionLoadPost', -- after loading a session file
+    'SessionWritePost', -- after writing a session file
     'ShellCmdPost', -- after ":!cmd"
     'ShellFilterPost', -- after ":1,2!cmd", ":w !cmd", ":r !cmd".
     'Signal', -- after nvim process received a signal

src/nvim/ex_session.c

@@ -12,6 +12,7 @@
 #include "nvim/arglist.h"
 #include "nvim/arglist_defs.h"
 #include "nvim/ascii_defs.h"
+#include "nvim/autocmd.h"
 #include "nvim/buffer.h"
 #include "nvim/buffer_defs.h"
 #include "nvim/eval.h"
@@ -1092,6 +1093,8 @@ void ex_mkrc(exarg_T *eap)
   }
 
   xfree(viewFile);
+
+  apply_autocmds(EVENT_SESSIONWRITEPOST, NULL, NULL, false, curbuf);
 }
 
 /// @return  the name of the view file for the current buffer.