# HG changeset patch
# User Christian Brabandt <cb@256bit.org>
# Date 1500477304 -7200
# Node ID c43118ecb0a392c8400ad1b10b8bad651ef81e39
# Parent  8f67bf01e910bc1c205f5e5cd52856989942c07e
patch 8.0.0735: no indication that the quickfix window/buffer changed

commit https://github.com/vim/vim/commit/a8788f4d0b991f466b607c2c5bc6fd600bc78a97
Author: Bram Moolenaar <Bram@vim.org>
Date:   Wed Jul 19 17:06:20 2017 +0200

    patch 8.0.0735: no indication that the quickfix window/buffer changed

    Problem:    There is no way to notice that the quickfix window contents has
                changed.
    Solution:   Increment b:changedtick when updating the quickfix window.
                (Yegappan Lakshmanan)

diff --git a/runtime/doc/quickfix.txt b/runtime/doc/quickfix.txt
--- a/runtime/doc/quickfix.txt
+++ b/runtime/doc/quickfix.txt
@@ -425,7 +425,9 @@ 2. The error window					*quickfix-window
 			which will indicate the command that produced the
 			quickfix list. This can be used to compose a custom
 			status line if the value of 'statusline' is adjusted
-			properly.
+			properly. Whenever this buffer is modified by a
+			quickfix command or function, the |b:changedtick|
+			variable is incremented.
 
 							*:lop* *:lopen*
 :lop[en] [height]	Open a window to show the location list for the
diff --git a/src/quickfix.c b/src/quickfix.c
--- a/src/quickfix.c
+++ b/src/quickfix.c
@@ -3286,6 +3286,7 @@ qf_update_buffer(qf_info_T *qi, qfline_T
 	qf_update_win_titlevar(qi);
 
 	qf_fill_buffer(qi, buf, old_last);
+	++CHANGEDTICK(buf);
 
 	if (old_last == NULL)
 	{
diff --git a/src/testdir/test_quickfix.vim b/src/testdir/test_quickfix.vim
--- a/src/testdir/test_quickfix.vim
+++ b/src/testdir/test_quickfix.vim
@@ -2263,3 +2263,27 @@ func Test_resize_from_copen()
 	augroup! QF_Test
     endtry
 endfunc
+
+" Tests for the quickfix buffer b:changedtick variable
+func Xchangedtick_tests(cchar)
+  call s:setup_commands(a:cchar)
+
+  new | only
+
+  Xexpr "" | Xexpr "" | Xexpr ""
+
+  Xopen
+  Xolder
+  Xolder
+  Xaddexpr "F1:10:Line10"
+  Xaddexpr "F2:20:Line20"
+  call g:Xsetlist([{"filename":"F3", "lnum":30, "text":"Line30"}], 'a')
+  call g:Xsetlist([], 'f')
+  call assert_equal(8, getbufvar('%', 'changedtick'))
+  Xclose
+endfunc
+
+func Test_changedtick()
+    call Xchangedtick_tests('c')
+    call Xchangedtick_tests('l')
+endfunc
diff --git a/src/version.c b/src/version.c
--- a/src/version.c
+++ b/src/version.c
@@ -770,6 +770,8 @@ static char *(features[]) =
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    735,
+/**/
     734,
 /**/
     733,