diff --git a/runtime/doc/autocmd.txt b/runtime/doc/autocmd.txt
index 1641361..5f9f51e 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 Jan 23
+*autocmd.txt*   For Vim version 9.1.  Last change: 2024 Jan 25
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -381,6 +381,7 @@
 |CursorMoved|		the cursor was moved in Normal mode
 |CursorMovedI|		the cursor was moved in Insert mode
 
+|WinNewPre|		before creating a new window
 |WinNew|		after creating a new window
 |TabNew|		after creating a new tab page
 |WinClosed|		after closing a window
@@ -1390,6 +1391,18 @@
 				WinLeave autocommands (but not for ":new").
 				Not used for ":qa" or ":q" when exiting Vim.
 
+							*WinNewPre*
+WinNewPre			Before creating a new window. Triggered
+				before commands that modify window layout by
+				creating a split or new tab page. Not done for
+				the first window, when Vim has just started.
+				It is not allowed to modify window layout
+				while executing commands for the WinNewPre
+				event.
+				Most useful to store current window layout
+				and compare it with the new layout after the
+				Window has been created.
+
 							*WinNew*
 WinNew				When a new window was created.  Not done for
 				the first window, when Vim has just started.
diff --git a/runtime/doc/tags b/runtime/doc/tags
index 9a89916..ee6c0a9 100644
--- a/runtime/doc/tags
+++ b/runtime/doc/tags
@@ -5785,6 +5785,7 @@
 WinEnter	autocmd.txt	/*WinEnter*
 WinLeave	autocmd.txt	/*WinLeave*
 WinNew	autocmd.txt	/*WinNew*
+WinNewPre	autocmd.txt	/*WinNewPre*
 WinResized	autocmd.txt	/*WinResized*
 WinResized-event	windows.txt	/*WinResized-event*
 WinScrolled	autocmd.txt	/*WinScrolled*
diff --git a/runtime/doc/todo.txt b/runtime/doc/todo.txt
index c29ac2e..bb58597 100644
--- a/runtime/doc/todo.txt
+++ b/runtime/doc/todo.txt
@@ -4667,7 +4667,6 @@
 
 
 Autocommands:
-9   Add WinNewPre - before creating a new window. #10635
 9   When triggering WinNew provide the window ID somehow.  #10633
 9   Rework the code from FEAT_OSFILETYPE for autocmd-osfiletypes to use
     'filetype'.  Only for when the current buffer is known.
diff --git a/runtime/syntax/vim.vim b/runtime/syntax/vim.vim
index 46fe568..73884cc 100644
--- a/runtime/syntax/vim.vim
+++ b/runtime/syntax/vim.vim
@@ -11,6 +11,7 @@
 " 	2024 Jan 14 by Vim Project (TermResponseAll autocommand)
 " 	2024 Jan 15 by Vim Project (:hi ctermfont attribute)
 " 	2024 Jan 23 by Vim Project (add :[23]match commands)
+" 	2024 Jan 25 by Vim Project (WinNewPre autocommand)
 " Version:	9.0-25
 " URL:	http://www.drchip.org/astronaut/vim/index.html#SYNTAX_VIM
 " Automatically generated keyword lists: {{{1
@@ -76,7 +77,7 @@
 
 " AutoCmd Events {{{2
 syn case ignore
-syn keyword vimAutoEvent contained	BufAdd BufDelete BufFilePost BufHidden BufNew BufRead BufReadPost BufUnload BufWinLeave BufWrite BufWritePost CmdlineChanged CmdlineLeave CmdwinEnter ColorScheme CompleteChanged CompleteDonePre CursorHoldI CursorMovedI DiffUpdated DirChanged DirChangedPre EncodingChanged ExitPre FileAppendCmd FileAppendPost FileAppendPre FileChangedRO FileChangedShell FileChangedShellPost FileEncoding FileExplorer FileReadCmd FileReadPost FileReadPre FileType FileWriteCmd FileWritePost FileWritePre FilterReadPost FilterReadPre FilterWritePost FilterWritePre FocusGained FocusLost FuncUndefined GUIEnter GUIFailed InsertChange InsertCharPre InsertEnter InsertLeave InsertLeavePre MenuPopup ModeChanged OptionSet QuickFixCmdPost QuickFixCmdPre QuitPre RemoteReply SafeState SafeStateAgain SessionLoadPost ShellCmdPost ShellFilterPost SigUSR1 SourceCmd SourcePost SourcePre SpellFileMissing StdinReadPost StdinReadPre SwapExists Syntax TabClosed TabEnter TabLeave TabNew TermChanged TerminalOpen TerminalWinOpen TermResponse TermResponseAll TextChanged TextChangedI TextChangedP TextChangedT TextYankPost User VimEnter VimLeave VimLeavePre VimResized VimResume VimSuspend WinClosed WinEnter WinLeave WinNew WinResized WinScrolled
+syn keyword vimAutoEvent contained	BufAdd BufDelete BufFilePost BufHidden BufNew BufRead BufReadPost BufUnload BufWinLeave BufWrite BufWritePost CmdlineChanged CmdlineLeave CmdwinEnter ColorScheme CompleteChanged CompleteDonePre CursorHoldI CursorMovedI DiffUpdated DirChanged DirChangedPre EncodingChanged ExitPre FileAppendCmd FileAppendPost FileAppendPre FileChangedRO FileChangedShell FileChangedShellPost FileEncoding FileExplorer FileReadCmd FileReadPost FileReadPre FileType FileWriteCmd FileWritePost FileWritePre FilterReadPost FilterReadPre FilterWritePost FilterWritePre FocusGained FocusLost FuncUndefined GUIEnter GUIFailed InsertChange InsertCharPre InsertEnter InsertLeave InsertLeavePre MenuPopup ModeChanged OptionSet QuickFixCmdPost QuickFixCmdPre QuitPre RemoteReply SafeState SafeStateAgain SessionLoadPost ShellCmdPost ShellFilterPost SigUSR1 SourceCmd SourcePost SourcePre SpellFileMissing StdinReadPost StdinReadPre SwapExists Syntax TabClosed TabEnter TabLeave TabNew TermChanged TerminalOpen TerminalWinOpen TermResponse TermResponseAll TextChanged TextChangedI TextChangedP TextChangedT TextYankPost User VimEnter VimLeave VimLeavePre VimResized VimResume VimSuspend WinClosed WinEnter WinLeave WinNewPre WinNew WinResized WinScrolled
 syn keyword vimAutoEvent contained	BufCreate BufEnter BufFilePre BufLeave BufNewFile BufReadCmd BufReadPre BufWinEnter BufWipeout BufWriteCmd BufWritePre CmdlineEnter CmdUndefined CmdwinLeave ColorSchemePre CompleteDone CursorHold CursorMoved
 
 " Highlight commonly used Groupnames {{{2
diff --git a/src/autocmd.c b/src/autocmd.c
index 80ce8ca..7e4a1b2 100644
--- a/src/autocmd.c
+++ b/src/autocmd.c
@@ -188,6 +188,7 @@
     {"VimEnter",	EVENT_VIMENTER},
     {"VimLeave",	EVENT_VIMLEAVE},
     {"VimLeavePre",	EVENT_VIMLEAVEPRE},
+    {"WinNewPre",	EVENT_WINNEWPRE},
     {"WinNew",		EVENT_WINNEW},
     {"WinClosed",	EVENT_WINCLOSED},
     {"WinEnter",	EVENT_WINENTER},
diff --git a/src/testdir/test_autocmd.vim b/src/testdir/test_autocmd.vim
index cecb55a..be73c18 100644
--- a/src/testdir/test_autocmd.vim
+++ b/src/testdir/test_autocmd.vim
@@ -270,6 +270,7 @@
   let g:record = []
 
   augroup testing
+    au WinNewPre * call add(g:record, 'WinNewPre')
     au WinNew * call add(g:record, 'WinNew')
     au WinClosed * call add(g:record, 'WinClosed')
     au WinEnter * call add(g:record, 'WinEnter')
@@ -286,8 +287,8 @@
   close
 
   call assert_equal([
-	\ 'WinLeave', 'WinNew', 'WinEnter',
-	\ 'WinLeave', 'TabLeave', 'WinNew', 'WinEnter', 'TabNew', 'TabEnter',
+	\ 'WinNewPre', 'WinLeave', 'WinNew', 'WinEnter',
+	\ 'WinLeave', 'TabLeave', 'WinNewPre', 'WinNew', 'WinEnter', 'TabNew', 'TabEnter',
 	\ 'WinLeave', 'TabLeave', 'WinClosed', 'TabClosed', 'WinEnter', 'TabEnter',
 	\ 'WinLeave', 'WinClosed', 'WinEnter'
 	\ ], g:record)
@@ -298,17 +299,96 @@
   bwipe somefile
 
   call assert_equal([
-	\ 'WinLeave', 'TabLeave', 'WinNew', 'WinEnter', 'TabNew', 'TabEnter',
+	\ 'WinLeave', 'TabLeave', 'WinNewPre', 'WinNew', 'WinEnter', 'TabNew', 'TabEnter',
 	\ 'WinLeave', 'TabLeave', 'WinEnter', 'TabEnter',
 	\ 'WinClosed', 'TabClosed'
 	\ ], g:record)
 
+  let g:record = []
+  copen
+  help
+  tabnext
+  vnew
+
+  call assert_equal([
+	\ 'WinNewPre', 'WinLeave', 'WinNew', 'WinEnter',
+	\ 'WinNewPre', 'WinLeave', 'WinNew', 'WinEnter',
+	\ 'WinNewPre', 'WinLeave', 'WinNew', 'WinEnter'
+	\ ], g:record)
+
   augroup testing
     au!
   augroup END
   unlet g:record
 endfunc
 
+func Test_WinNewPre()
+  " Test that the old window layout can be accessed before a new window is created.
+  let g:layouts_pre = []
+  let g:layouts_post = []
+  augroup testing
+    au WinNewPre * call add(g:layouts_pre, winlayout())
+    au WinNew * call add(g:layouts_post, winlayout())
+  augroup END
+  split
+  call assert_notequal(g:layouts_pre[0], g:layouts_post[0])
+  split
+  call assert_equal(g:layouts_pre[1], g:layouts_post[0])
+  call assert_notequal(g:layouts_pre[1], g:layouts_post[1])
+  tabnew
+  call assert_notequal(g:layouts_pre[2], g:layouts_post[1])
+  call assert_notequal(g:layouts_pre[2], g:layouts_post[2])
+  augroup testing
+    au!
+  augroup END
+  unlet g:layouts_pre
+  unlet g:layouts_post
+
+  " Test modifying window layout during WinNewPre throws.
+  let g:caught = 0
+  augroup testing
+    au!
+    au WinNewPre * split
+  augroup END
+  try
+    vnew
+  catch
+    let g:caught += 1
+  endtry
+  augroup testing
+    au!
+    au WinNewPre * tabnew
+  augroup END
+  try
+    vnew
+  catch
+    let g:caught += 1
+  endtry
+  augroup testing
+    au!
+    au WinNewPre * close
+  augroup END
+  try
+    vnew
+  catch
+    let g:caught += 1
+  endtry
+  augroup testing
+    au!
+    au WinNewPre * tabclose
+  augroup END
+  try
+    vnew
+  catch
+    let g:caught += 1
+  endtry
+  call assert_equal(4, g:caught)
+  augroup testing
+    au!
+  augroup END
+  unlet g:caught
+endfunc
+
 func Test_WinResized()
   CheckRunVimInTerminal
 
diff --git a/src/version.c b/src/version.c
index 10a70e3..841d018 100644
--- a/src/version.c
+++ b/src/version.c
@@ -705,6 +705,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    59,
+/**/
     58,
 /**/
     57,
diff --git a/src/vim.h b/src/vim.h
index 0f52ba2..fe23958 100644
--- a/src/vim.h
+++ b/src/vim.h
@@ -1435,7 +1435,8 @@
     EVENT_VIMRESIZED,		// after Vim window was resized
     EVENT_WINENTER,		// after entering a window
     EVENT_WINLEAVE,		// before leaving a window
-    EVENT_WINNEW,		// when entering a new window
+    EVENT_WINNEWPRE,		// before creating a new window
+    EVENT_WINNEW,		// after creating a new window
     EVENT_WINCLOSED,		// after closing a window
     EVENT_VIMSUSPEND,		// before Vim is suspended
     EVENT_VIMRESUME,		// after Vim is resumed
diff --git a/src/window.c b/src/window.c
index fda42e9..5cb6c3c 100644
--- a/src/window.c
+++ b/src/window.c
@@ -19,6 +19,7 @@
 static void win_rotate(int, int);
 static void win_totop(int size, int flags);
 static void win_equal_rec(win_T *next_curwin, int current, frame_T *topfr, int dir, int col, int row, int width, int height);
+static void trigger_winnewpre(void);
 static void trigger_winclosed(win_T *win);
 static win_T *win_free_mem(win_T *win, int *dirp, tabpage_T *tp);
 static frame_T *win_altframe(win_T *win, tabpage_T *tp);
@@ -955,6 +956,8 @@
     // Do not redraw here, curwin->w_buffer may be invalid.
     ++RedrawingDisabled;
 
+    trigger_winnewpre();
+
     if (flags & WSP_TOP)
 	oldwin = firstwin;
     else if (flags & WSP_BOT)
@@ -2887,6 +2890,14 @@
 }
 
     static void
+trigger_winnewpre(void)
+{
+    window_layout_lock();
+    apply_autocmds(EVENT_WINNEWPRE, NULL, NULL, FALSE, NULL);
+    window_layout_unlock();
+}
+
+    static void
 trigger_winclosed(win_T *win)
 {
     static int	recursive = FALSE;
@@ -4477,6 +4488,9 @@
 
     newtp->tp_localdir = (tp->tp_localdir == NULL)
 				    ? NULL : vim_strsave(tp->tp_localdir);
+
+    trigger_winnewpre();
+
     // Create a new empty window.
     if (win_alloc_firstwin(tp->tp_curwin) == OK)
     {