diff --git a/runtime/doc/autocmd.txt b/runtime/doc/autocmd.txt
index 090c216fcb..e99b7ab8b4 100644
--- a/runtime/doc/autocmd.txt
+++ b/runtime/doc/autocmd.txt
@@ -294,6 +294,7 @@ Name			triggered by ~
 |CursorMoved|		the cursor was moved in Normal mode
 |CursorMovedI|		the cursor was moved in Insert mode
 
+|WinNew|		after creating a new window
 |WinEnter|		after entering another window
 |WinLeave|		before leaving a window
 |TabEnter|		after entering another tab page
@@ -992,6 +993,11 @@ WinLeave			Before leaving a window.  If the window to be
 				WinLeave autocommands (but not for ":new").
 				Not used for ":qa" or ":q" when exiting Vim.
 
+							*WinNew*
+WinNew				When a new window was created.  Not done for
+				the fist window, when Vim has just started.
+				Before a WinEnter event.
+
 ==============================================================================
 6. Patterns					*autocmd-patterns* *{pat}*
 
diff --git a/src/nvim/auevents.lua b/src/nvim/auevents.lua
index 8d891effae..b405928577 100644
--- a/src/nvim/auevents.lua
+++ b/src/nvim/auevents.lua
@@ -89,6 +89,7 @@ return {
     'VimLeave',               -- before exiting Vim
     'VimLeavePre',            -- before exiting Vim and writing ShaDa file
     'VimResized',             -- after Vim window was resized
+    'WinNew',                 -- when entering a new window
     'WinEnter',               -- after entering a window
     'WinLeave',               -- before leaving a window
   },
diff --git a/src/nvim/buffer.c b/src/nvim/buffer.c
index 8909fdd57a..600cf575fc 100644
--- a/src/nvim/buffer.c
+++ b/src/nvim/buffer.c
@@ -409,9 +409,6 @@ void close_buffer(win_T *win, buf_T *buf, int action, int abort_if_last)
   buf->b_nwindows = nwindows;
 
   buf_freeall(buf, (del_buf ? BFA_DEL : 0) + (wipe_buf ? BFA_WIPE : 0));
-  if (win_valid_any_tab(win) && win->w_buffer == buf) {
-    win->w_buffer = NULL;  // make sure we don't use the buffer now
-  }
 
   /* Autocommands may have deleted the buffer. */
   if (!buf_valid(buf))
@@ -419,11 +416,6 @@ void close_buffer(win_T *win, buf_T *buf, int action, int abort_if_last)
   if (aborting())           /* autocmds may abort script processing */
     return;
 
-  /* Autocommands may have opened or closed windows for this buffer.
-   * Decrement the count for the close we do here. */
-  if (buf->b_nwindows > 0)
-    --buf->b_nwindows;
-
   /*
    * It's possible that autocommands change curbuf to the one being deleted.
    * This might cause the previous curbuf to be deleted unexpectedly.  But
@@ -434,6 +426,16 @@ void close_buffer(win_T *win, buf_T *buf, int action, int abort_if_last)
   if (buf == curbuf && !is_curbuf)
     return;
 
+  if (win_valid_any_tab(win) && win->w_buffer == buf) {
+    win->w_buffer = NULL;  // make sure we don't use the buffer now
+  }
+
+  // Autocommands may have opened or closed windows for this buffer.
+  // Decrement the count for the close we do here.
+  if (buf->b_nwindows > 0) {
+    buf->b_nwindows--;
+  }
+
   /* Change directories when the 'acd' option is set. */
   do_autochdir();
 
diff --git a/src/nvim/fileio.c b/src/nvim/fileio.c
index 6f95ced147..e734cde905 100644
--- a/src/nvim/fileio.c
+++ b/src/nvim/fileio.c
@@ -5373,6 +5373,8 @@ static AutoPatCmd *active_apc_list = NULL; /* stack of active autocommands */
  */
 static garray_T augroups = {0, 0, sizeof(char_u *), 10, NULL};
 #define AUGROUP_NAME(i) (((char_u **)augroups.ga_data)[i])
+// use get_deleted_augroup() to get this
+static char_u *deleted_augroup = NULL;
 
 /*
  * The ID of the current group.  Group 0 is the default one.
@@ -5387,6 +5389,14 @@ static event_T last_event;
 static int last_group;
 static int autocmd_blocked = 0;         /* block all autocmds */
 
+static char_u *get_deleted_augroup(void)
+{
+    if (deleted_augroup == NULL) {
+      deleted_augroup = (char_u *)_("--Deleted--");
+    }
+    return deleted_augroup;
+}
+
 /*
  * Show the autocommands for one AutoPat.
  */
@@ -5406,10 +5416,11 @@ static void show_autocmd(AutoPat *ap, event_T event)
     return;
   if (event != last_event || ap->group != last_group) {
     if (ap->group != AUGROUP_DEFAULT) {
-      if (AUGROUP_NAME(ap->group) == NULL)
-        msg_puts_attr((char_u *)_("--Deleted--"), hl_attr(HLF_E));
-      else
+      if (AUGROUP_NAME(ap->group) == NULL) {
+        msg_puts_attr(get_deleted_augroup(), hl_attr(HLF_E));
+      } else {
         msg_puts_attr(AUGROUP_NAME(ap->group), hl_attr(HLF_T));
+      }
       msg_puts((char_u *)"  ");
     }
     msg_puts_attr(event_nr2name(event), hl_attr(HLF_T));
@@ -5575,11 +5586,33 @@ static void au_del_group(char_u *name)
   int i;
 
   i = au_find_group(name);
-  if (i == AUGROUP_ERROR)       /* the group doesn't exist */
+  if (i == AUGROUP_ERROR) {      // the group doesn't exist
     EMSG2(_("E367: No such group: \"%s\""), name);
-  else {
+  } else if (i == current_augroup) {
+    EMSG(_("E936: Cannot delete the current group"));
+  } else {
+    event_T event;
+    AutoPat *ap;
+    int in_use = false;
+
+    for (event = (event_T)0; (int)event < (int)NUM_EVENTS;
+         event = (event_T)((int)event + 1)) {
+      for (ap = first_autopat[(int)event]; ap != NULL; ap = ap->next) {
+        if (ap->group == i && ap->pat != NULL) {
+          give_warning((char_u *)
+                       _("W19: Deleting augroup that is still in use"), true);
+          in_use = true;
+          event = NUM_EVENTS;
+          break;
+        }
+      }
+    }
     xfree(AUGROUP_NAME(i));
-    AUGROUP_NAME(i) = NULL;
+    if (in_use) {
+      AUGROUP_NAME(i) = get_deleted_augroup();
+    } else {
+      AUGROUP_NAME(i) = NULL;
+    }
   }
 }
 
@@ -5591,8 +5624,9 @@ static void au_del_group(char_u *name)
 static int au_find_group(const char_u *name)
   FUNC_ATTR_PURE FUNC_ATTR_WARN_UNUSED_RESULT
 {
-  for (int i = 0; i < augroups.ga_len; ++i) {
-    if (AUGROUP_NAME(i) != NULL && STRCMP(AUGROUP_NAME(i), name) == 0) {
+  for (int i = 0; i < augroups.ga_len; i++) {
+    if (AUGROUP_NAME(i) != NULL && AUGROUP_NAME(i) != get_deleted_augroup()
+        && STRCMP(AUGROUP_NAME(i), name) == 0) {
       return i;
     }
   }
@@ -5640,10 +5674,21 @@ void do_augroup(char_u *arg, int del_group)
 #if defined(EXITFREE)
 void free_all_autocmds(void)
 {
+  int i;
+  char_u *s;
+
   for (current_augroup = -1; current_augroup < augroups.ga_len;
-       ++current_augroup)
-    do_autocmd((char_u *)"", TRUE);
-  ga_clear_strings(&augroups);
+       current_augroup++) {
+    do_autocmd((char_u *)"", true);
+  }
+
+  for (i = 0; i < augroups.ga_len; i++) {
+      s = ((char_u **)(augroups.ga_data))[i];
+      if (s != get_deleted_augroup()) {
+          xfree(s);
+      }
+  }
+  ga_clear(&augroups);
 }
 
 #endif
@@ -7105,9 +7150,11 @@ char_u *get_augroup_name(expand_T *xp, int idx)
     return (char_u *)"END";
   if (idx >= augroups.ga_len)           /* end of list */
     return NULL;
-  if (AUGROUP_NAME(idx) == NULL)        /* skip deleted entries */
+  if (AUGROUP_NAME(idx) == NULL || AUGROUP_NAME(idx) == get_deleted_augroup()) {
+    // skip deleted entries
     return (char_u *)"";
-  return AUGROUP_NAME(idx);             /* return a name */
+  }
+  return AUGROUP_NAME(idx);             // return a name
 }
 
 static int include_groups = FALSE;
@@ -7164,10 +7211,12 @@ set_context_in_autocmd (
  */
 char_u *get_event_name(expand_T *xp, int idx)
 {
-  if (idx < augroups.ga_len) {          /* First list group names, if wanted */
-    if (!include_groups || AUGROUP_NAME(idx) == NULL)
-      return (char_u *)"";              /* skip deleted entries */
-    return AUGROUP_NAME(idx);           /* return a name */
+  if (idx < augroups.ga_len) {          // First list group names, if wanted
+    if (!include_groups || AUGROUP_NAME(idx) == NULL
+        || AUGROUP_NAME(idx) == get_deleted_augroup()) {
+      return (char_u *)"";              // skip deleted entries
+    }
+    return AUGROUP_NAME(idx);           // return a name
   }
   return (char_u *)event_names[idx - augroups.ga_len].name;
 }
diff --git a/src/nvim/testdir/test_autocmd.vim b/src/nvim/testdir/test_autocmd.vim
index 5675697dc4..f05a55f1aa 100644
--- a/src/nvim/testdir/test_autocmd.vim
+++ b/src/nvim/testdir/test_autocmd.vim
@@ -64,6 +64,66 @@ function Test_bufunload()
   augroup! test_bufunload_group
 endfunc
 
+" SEGV occurs in older versions.  (At least 7.4.2005 or older)
+function Test_autocmd_bufunload_with_tabnext()
+  tabedit
+  tabfirst
+
+  augroup test_autocmd_bufunload_with_tabnext_group
+    autocmd!
+    autocmd BufUnload <buffer> tabnext
+  augroup END
+
+  quit
+  call assert_equal(2, tabpagenr('$'))
+
+  augroup! test_autocmd_bufunload_with_tabnext_group
+  tablast
+  quit
+endfunc
+
+func Test_win_tab_autocmd()
+  let g:record = []
+
+  augroup testing
+    au WinNew * call add(g:record, 'WinNew')
+    au WinEnter * call add(g:record, 'WinEnter') 
+    au WinLeave * call add(g:record, 'WinLeave') 
+    au TabNew * call add(g:record, 'TabNew')
+    au TabClosed * call add(g:record, 'TabClosed')
+    au TabEnter * call add(g:record, 'TabEnter')
+    au TabLeave * call add(g:record, 'TabLeave')
+  augroup END
+
+  split
+  tabnew
+  close
+  close
+
+  call assert_equal([
+	\ 'WinLeave', 'WinNew', 'WinEnter',
+	\ 'WinLeave', 'TabLeave', 'WinNew', 'WinEnter', 'TabNew', 'TabEnter',
+	\ 'WinLeave', 'TabLeave', 'TabClosed', 'WinEnter', 'TabEnter',
+	\ 'WinLeave', 'WinEnter'
+	\ ], g:record)
+
+  let g:record = []
+  tabnew somefile
+  tabnext
+  bwipe somefile
+
+  call assert_equal([
+	\ 'WinLeave', 'TabLeave', 'WinNew', 'WinEnter', 'TabNew', 'TabEnter',
+	\ 'WinLeave', 'TabLeave', 'WinEnter', 'TabEnter',
+	\ 'TabClosed'
+	\ ], g:record)
+
+  augroup testing
+    au!
+  augroup END
+  unlet g:record
+endfunc
+
 func s:AddAnAutocmd()
   augroup vimBarTest
     au BufReadCmd * echo 'hello'
@@ -91,3 +151,48 @@ func Test_early_bar()
   au! vimBarTest|echo 'hello'
   call assert_equal(1, len(split(execute('au vimBarTest'), "\n")))
 endfunc
+
+func RemoveGroup()
+  autocmd! StartOK
+  augroup! StartOK
+endfunc
+
+func Test_augroup_warning()
+  augroup TheWarning
+    au VimEnter * echo 'entering'
+  augroup END
+  call assert_true(match(execute('au VimEnter'), "TheWarning.*VimEnter") >= 0)
+  redir => res
+  augroup! TheWarning
+  redir END
+  call assert_true(match(res, "W19:") >= 0)
+  call assert_true(match(execute('au VimEnter'), "-Deleted-.*VimEnter") >= 0)
+
+  " check "Another" does not take the pace of the deleted entry
+  augroup Another
+  augroup END
+  call assert_true(match(execute('au VimEnter'), "-Deleted-.*VimEnter") >= 0)
+
+  " no warning for postpone aucmd delete
+  augroup StartOK
+    au VimEnter * call RemoveGroup()
+  augroup END
+  call assert_true(match(execute('au VimEnter'), "StartOK.*VimEnter") >= 0)
+  redir => res
+  doautocmd VimEnter
+  redir END
+  call assert_true(match(res, "W19:") < 0)
+  au! VimEnter
+endfunc
+
+func Test_augroup_deleted()
+  " This caused a crash before E936 was introduced
+  augroup x
+    call assert_fails('augroup! x', 'E936:')
+    au VimEnter * echo
+  augroup end
+  augroup! x
+  call assert_true(match(execute('au VimEnter'), "-Deleted-.*VimEnter") >= 0)
+  au! VimEnter
+endfunc
+
diff --git a/src/nvim/version.c b/src/nvim/version.c
index 04b42ed39f..acaad38ca2 100644
--- a/src/nvim/version.c
+++ b/src/nvim/version.c
@@ -126,8 +126,8 @@ static int included_patches[] = {
   // 2317,
   // 2316 NA
   // 2315,
-  // 2314,
-  // 2313,
+  2314,
+  2313,
   2312,
   // 2311 NA
   // 2310 NA
@@ -140,7 +140,7 @@ static int included_patches[] = {
   // 2303,
   // 2302 NA
   // 2301 NA
-  // 2300,
+  2300,
   // 2299,
   // 2298 NA
   // 2297 NA
@@ -323,7 +323,7 @@ static int included_patches[] = {
   // 2120,
   // 2119,
   // 2118 NA
-  // 2117,
+  2117,
   // 2116 NA
   // 2115 NA
   // 2114 NA
@@ -363,9 +363,9 @@ static int included_patches[] = {
   // 2080,
   // 2079 NA
   // 2078 NA
-  // 2077,
+  2077,
   // 2076,
-  // 2075,
+  2075,
   // 2074,
   // 2073 NA
   // 2072,
@@ -434,7 +434,7 @@ static int included_patches[] = {
   2009,
   2008,
   2007,
-  // 2006,
+  2006,
   2005,
   // 2004 NA
   // 2003 NA
diff --git a/src/nvim/window.c b/src/nvim/window.c
index 00229ccca9..89228e1b0f 100644
--- a/src/nvim/window.c
+++ b/src/nvim/window.c
@@ -973,11 +973,12 @@ int win_split_ins(int size, int flags, win_T *new_wp, int dir)
   /*
    * make the new window the current window
    */
-  win_enter(wp, false);
-  if (flags & WSP_VERT)
+  win_enter_ext(wp, false, false, true, true, true);
+  if (flags & WSP_VERT) {
     p_wiw = i;
-  else
+  } else {
     p_wh = i;
+  }
 
   return OK;
 }
@@ -1718,6 +1719,7 @@ close_windows (
 {
   tabpage_T   *tp, *nexttp;
   int h = tabline_height();
+  int count = tabpage_index(NULL);
 
   ++RedrawingDisabled;
 
@@ -1754,9 +1756,14 @@ close_windows (
 
   --RedrawingDisabled;
 
-  redraw_tabline = TRUE;
-  if (h != tabline_height())
+  if (count != tabpage_index(NULL)) {
+    apply_autocmds(EVENT_TABCLOSED, NULL, NULL, false, curbuf);
+  }
+
+  redraw_tabline = true;
+  if (h != tabline_height()) {
     shell_new_rows();
+  }
 }
 
 /// Check that current window is the last one.
@@ -2014,10 +2021,11 @@ int win_close(win_T *win, int free_buf)
   }
 
   if (close_curwin) {
-    win_enter_ext(wp, false, TRUE, TRUE, TRUE);
-    if (other_buffer)
-      /* careful: after this wp and win may be invalid! */
-      apply_autocmds(EVENT_BUFENTER, NULL, NULL, FALSE, curbuf);
+    win_enter_ext(wp, false, true, false, true, true);
+    if (other_buffer) {
+      // careful: after this wp and win may be invalid!
+      apply_autocmds(EVENT_BUFENTER, NULL, NULL, false, curbuf);
+    }
   }
 
   /*
@@ -3045,8 +3053,9 @@ int win_new_tabpage(int after, char_u *filename)
 
     redraw_all_later(CLEAR);
 
-    apply_autocmds(EVENT_TABNEW, filename, filename, false, curbuf);
+    apply_autocmds(EVENT_WINNEW, NULL, NULL, false, curbuf);
     apply_autocmds(EVENT_WINENTER, NULL, NULL, false, curbuf);
+    apply_autocmds(EVENT_TABNEW, filename, filename, false, curbuf);
     apply_autocmds(EVENT_TABENTER, NULL, NULL, false, curbuf);
 
     return OK;
@@ -3204,8 +3213,8 @@ static void enter_tabpage(tabpage_T *tp, buf_T *old_curbuf, int trigger_enter_au
   /* We would like doing the TabEnter event first, but we don't have a
    * valid current window yet, which may break some commands.
    * This triggers autocommands, thus may make "tp" invalid. */
-  win_enter_ext(tp->tp_curwin, false, TRUE,
-      trigger_enter_autocmds, trigger_leave_autocmds);
+  win_enter_ext(tp->tp_curwin, false, true, false,
+                trigger_enter_autocmds, trigger_leave_autocmds);
   prevwin = next_prevwin;
 
   last_status(FALSE);           /* status line may appear or disappear */
@@ -3546,7 +3555,7 @@ end:
  */
 void win_enter(win_T *wp, bool undo_sync)
 {
-  win_enter_ext(wp, undo_sync, FALSE, TRUE, TRUE);
+  win_enter_ext(wp, undo_sync, false, false, true, true);
 }
 
 /*
@@ -3554,7 +3563,9 @@ void win_enter(win_T *wp, bool undo_sync)
  * Can be called with "curwin_invalid" TRUE, which means that curwin has just
  * been closed and isn't valid.
  */
-static void win_enter_ext(win_T *wp, bool undo_sync, int curwin_invalid, int trigger_enter_autocmds, int trigger_leave_autocmds)
+static void win_enter_ext(win_T *wp, bool undo_sync, int curwin_invalid,
+                          int trigger_new_autocmds, int trigger_enter_autocmds,
+                          int trigger_leave_autocmds)
 {
   int other_buffer = FALSE;
 
@@ -3630,6 +3641,9 @@ static void win_enter_ext(win_T *wp, bool undo_sync, int curwin_invalid, int tri
     shorten_fnames(TRUE);
   }
 
+  if (trigger_new_autocmds) {
+    apply_autocmds(EVENT_WINNEW, NULL, NULL, false, curbuf);
+  }
   if (trigger_enter_autocmds) {
     apply_autocmds(EVENT_WINENTER, NULL, NULL, FALSE, curbuf);
     if (other_buffer)
diff --git a/test/functional/autocmd/autocmd_spec.lua b/test/functional/autocmd/autocmd_spec.lua
index 162e112047..c38bd75c69 100644
--- a/test/functional/autocmd/autocmd_spec.lua
+++ b/test/functional/autocmd/autocmd_spec.lua
@@ -12,8 +12,8 @@ describe('autocmds:', function()
     local expected = {
       'WinLeave',
       'TabLeave',
-      'TabNew',
       'WinEnter',
+      'TabNew',
       'TabEnter',
       'BufLeave',
       'BufEnter'