3 files changed, 39 insertions, 7 deletions

diff --git a/src/nvim/os/lang.c b/src/nvim/os/lang.c
index 47c278ee97..6b2a54ddbe 100644
--- a/src/nvim/os/lang.c
+++ b/src/nvim/os/lang.c
@@ -31,7 +31,7 @@ void lang_init(void)
       char buf[20] = { 0 };
       if (CFStringGetCString(cf_lang_region, buf, 20,
                              kCFStringEncodingUTF8)) {
-        os_setenv("LANG", lang_region, true);
+        os_setenv("LANG", buf, true);
       }
     }
     CFRelease(cf_lang_region);
diff --git a/src/nvim/quickfix.c b/src/nvim/quickfix.c
index 664dd3e968..4308c4e87e 100644
--- a/src/nvim/quickfix.c
+++ b/src/nvim/quickfix.c
@@ -1044,10 +1044,12 @@ qf_init_ext(
   if (newlist || qi->qf_curlist == qi->qf_listcount) {
     // make place for a new list
     qf_new_list(qi, qf_title);
-  } else if (qi->qf_lists[qi->qf_curlist].qf_count > 0) {
+  } else {
     // Adding to existing list, use last entry.
     adding = true;
-    old_last = qi->qf_lists[qi->qf_curlist].qf_last;
+    if (qi->qf_lists[qi->qf_curlist].qf_count > 0) {
+      old_last = qi->qf_lists[qi->qf_curlist].qf_last;
+    }
   }
 
   // Use the local value of 'errorformat' if it's set.
@@ -2885,6 +2887,7 @@ static void qf_update_buffer(qf_info_T *qi, qfline_T *old_last)
     qf_update_win_titlevar(qi);
 
     qf_fill_buffer(qi, buf, old_last);
+    buf_inc_changedtick(buf);
 
     if (old_last == NULL) {
       (void)qf_win_pos_update(qi, 0);
@@ -4209,7 +4212,8 @@ int get_errorlist_properties(win_T *wp, dict_T *what, dict_T *retdict)
     if (qi->qf_lists[qf_idx].qf_ctx != NULL) {
       di = tv_dict_item_alloc_len(S_LEN("context"));
       tv_copy(qi->qf_lists[qf_idx].qf_ctx, &di->di_tv);
-      if (tv_dict_add(retdict, di) == FAIL) {
+      status = tv_dict_add(retdict, di);
+      if (status == FAIL) {
         tv_dict_item_free(di);
       }
     } else {
@@ -4398,6 +4402,7 @@ static int qf_set_properties(qf_info_T *qi, dict_T *what, int action)
     typval_T *ctx = xcalloc(1, sizeof(typval_T));
     tv_copy(&di->di_tv, ctx);
     qi->qf_lists[qf_idx].qf_ctx = ctx;
+    retval = OK;
   }
 
   return retval;
diff --git a/src/nvim/testdir/test_quickfix.vim b/src/nvim/testdir/test_quickfix.vim
index 8d2c61f6f0..33abb69ca6 100644
--- a/src/nvim/testdir/test_quickfix.vim
+++ b/src/nvim/testdir/test_quickfix.vim
@@ -1702,7 +1702,8 @@ func Xproperty_tests(cchar)
     Xopen
     wincmd p
     call g:Xsetlist([{'filename':'foo', 'lnum':27}])
-    call g:Xsetlist([], 'a', {'title' : 'Sample'})
+    let s = g:Xsetlist([], 'a', {'title' : 'Sample'})
+    call assert_equal(0, s)
     let d = g:Xgetlist({"title":1})
     call assert_equal('Sample', d.title)
 
@@ -1756,7 +1757,8 @@ func Xproperty_tests(cchar)
     endif
 
     " Context related tests
-    call g:Xsetlist([], 'a', {'context':[1,2,3]})
+    let s = g:Xsetlist([], 'a', {'context':[1,2,3]})
+    call assert_equal(0, s)
     call test_garbagecollect_now()
     let d = g:Xgetlist({'context':1})
     call assert_equal([1,2,3], d.context)
@@ -1821,8 +1823,9 @@ func Xproperty_tests(cchar)
     " Test for setting/getting items
     Xexpr ""
     let qfprev = g:Xgetlist({'nr':0})
-    call g:Xsetlist([], ' ', {'title':'Green',
+    let s = g:Xsetlist([], ' ', {'title':'Green',
 		\ 'items' : [{'filename':'F1', 'lnum':10}]})
+    call assert_equal(0, s)
     let qfcur = g:Xgetlist({'nr':0})
     call assert_true(qfcur.nr == qfprev.nr + 1)
     let l = g:Xgetlist({'items':1})
@@ -2242,3 +2245,27 @@ 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