diff --git a/src/menu.c b/src/menu.c
index 15dd5e415d..98986e9b21 100644
--- a/src/menu.c
+++ b/src/menu.c
@@ -1976,7 +1976,12 @@ gui_show_popupmenu(void)
 
     /* Only show a popup when it is defined and has entries */
     if (menu != NULL && menu->children != NULL)
+    {
+	/* Update the menus now, in case the MenuPopup autocommand did
+	 * anything. */
+	gui_update_menus(0);
 	gui_mch_show_popupmenu(menu);
+    }
 }
 #endif /* FEAT_GUI */
 
diff --git a/src/os_unix.c b/src/os_unix.c
index 913a025fac..dafd88b7e0 100644
--- a/src/os_unix.c
+++ b/src/os_unix.c
@@ -1090,6 +1090,12 @@ deathtrap SIGDEFARG(sigarg)
     /* Remember how often we have been called. */
     ++entered;
 
+#ifdef FEAT_AUTOCMD
+    /* Executing autocommands is likely to use more stack space than we have
+     * available in the signal stack. */
+    block_autocmds();
+#endif
+
 #ifdef FEAT_EVAL
     /* Set the v:dying variable. */
     set_vim_var_nr(VV_DYING, (long)entered);
@@ -1171,6 +1177,8 @@ deathtrap SIGDEFARG(sigarg)
      * calling free(). */
     preserve_exit();
 
+    /* NOTREACHED */
+
 #ifdef NBDEBUG
     reset_signals();
     may_core_dump();
diff --git a/src/testdir/test_channel.vim b/src/testdir/test_channel.vim
index d65e528b7b..9d68a14cce 100644
--- a/src/testdir/test_channel.vim
+++ b/src/testdir/test_channel.vim
@@ -1335,6 +1335,20 @@ func Test_using_freed_memory()
   call test_garbagecollect_now()
 endfunc
 
+func Test_collapse_buffers()
+  if !executable('cat')
+    return
+  endif
+  sp test_channel.vim
+  let g:linecount = line('$')
+  close
+  split testout
+  1,$delete
+  call job_start('cat test_channel.vim', {'out_io': 'buffer', 'out_name': 'testout'})
+  call s:waitFor('line("$") > g:linecount')
+  call assert_true(line('$') > g:linecount)
+  bwipe!
+endfunc
 
 
 " Uncomment this to see what happens, output is in src/testdir/channellog.
diff --git a/src/version.c b/src/version.c
index 2a2c409d2f..509a8ecfc3 100644
--- a/src/version.c
+++ b/src/version.c
@@ -768,6 +768,12 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1916,
+/**/
+    1915,
+/**/
+    1914,
 /**/
     1913,
 /**/