# HG changeset patch
# User Christian Brabandt <cb@256bit.org>
# Date 1519748106 -3600
# Node ID 4dbf2a6972e6c5620d1a84e30ff76fad7e918d0d
# Parent  52a3e42498e731cf6bbbbd873ddb7d86f3341658
patch 8.0.1547: undo in the options window makes it empty

commit https://github.com/vim/vim/commit/9c474b277336235012f0c058bbaef2961d1ec83e
Author: Bram Moolenaar <Bram@vim.org>
Date:   Tue Feb 27 17:04:25 2018 +0100

    patch 8.0.1547: undo in the options window makes it empty

    Problem:    Undo in the options window makes it empty.
    Solution:   Set 'undolevels' while filling the buffer. (Yasuhiro Matthew,
                closes #2645)

diff --git a/runtime/optwin.vim b/runtime/optwin.vim
--- a/runtime/optwin.vim
+++ b/runtime/optwin.vim
@@ -1,7 +1,7 @@
 " These commands create the option window.
 "
 " Maintainer:	Bram Moolenaar <Bram@vim.org>
-" Last Change:	2018 Feb 11
+" Last Change:	2018 Feb 27
 
 " If there already is an option window, jump to that one.
 let buf = bufnr('option-window')
@@ -122,11 +122,13 @@ fun! <SID>Update(lnum, line, local, this
 endfun
 
 " Reset 'title' and 'icon' to make it work faster.
+" Reset 'undolevels' to avoid undo'ing until the buffer is empty.
 let s:old_title = &title
 let s:old_icon = &icon
 let s:old_sc = &sc
 let s:old_ru = &ru
-set notitle noicon nosc noru
+let s:old_ul = &ul
+set notitle noicon nosc noru ul=-1
 
 " If the current window is a help window, try finding a non-help window.
 " Relies on syntax highlighting to be switched on.
@@ -756,7 +758,7 @@ call <SID>OptionG("km", &km)
 call <SID>Header("editing text")
 call append("$", "undolevels\tmaximum number of changes that can be undone")
 call append("$", "\t(global or local to buffer)")
-call append("$", " \tset ul=" . &ul)
+call append("$", " \tset ul=" . s:old_ul)
 call append("$", "undofile\tautomatically save and restore undo history")
 call <SID>BinOptionG("udf", &udf)
 call append("$", "undodir\tlist of directories for undo files")
@@ -1438,6 +1440,7 @@ let &icon = s:old_icon
 let &ru = s:old_ru
 let &sc = s:old_sc
 let &cpo = s:cpo_save
-unlet s:old_title s:old_icon s:old_ru s:old_sc s:cpo_save s:idx s:lnum
+let &ul = s:old_ul
+unlet s:old_title s:old_icon s:old_ru s:old_sc s:cpo_save s:idx s:lnum s:old_ul
 
 " vim: ts=8 sw=2 sts=2
diff --git a/src/version.c b/src/version.c
--- a/src/version.c
+++ b/src/version.c
@@ -779,6 +779,8 @@ static char *(features[]) =
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1547,
+/**/
     1546,
 /**/
     1545,