vim-patch:8.1.0602: DirChanged is also triggered when directory didn't change

Problem:    DirChanged is also triggered when the directory didn't change.
            (Daniel Hahler)
Solution:   Compare the current with the new directory. (closes vim/vim#3697)
2caad3fbbd

src/nvim/ex_docmd.c

@@ -7811,10 +7811,11 @@ void ex_cd(exarg_T *eap)
       break;
     }
 
-    if (vim_chdir(new_dir)) {
+    bool dir_differs = prev_dir == NULL || STRCMP(prev_dir, new_dir) != 0;
+    if (dir_differs && vim_chdir(new_dir)) {
       EMSG(_(e_failed));
     } else {
-      post_chdir(scope, true);
+      post_chdir(scope, dir_differs);
       // Echo the new current directory if the command was typed.
       if (KeyTyped || p_verbose >= 5) {
         ex_pwd(eap);

src/nvim/testdir/test_autochdir.vim

@@ -8,11 +8,19 @@ func Test_set_filename()
   let cwd = getcwd()
   call test_autochdir()
   set acd
+
+  let s:li = []
+  autocmd DirChanged auto call add(s:li, "autocd")
+  autocmd DirChanged auto call add(s:li, expand("<afile>"))
+
   new
   w samples/Xtest
   call assert_equal("Xtest", expand('%'))
   call assert_equal("samples", substitute(getcwd(), '.*/\(\k*\)', '\1', ''))
+  call assert_equal(["autocd", getcwd()], s:li)
+
   bwipe!
+  au! DirChanged
   set noacd
   exe 'cd ' . cwd
   call delete('samples/Xtest')

src/nvim/testdir/test_autocmd.vim

@@ -1334,13 +1334,16 @@ function s:Before_test_dirchanged()
   augroup END
   let s:li = []
   let s:dir_this = getcwd()
-  let s:dir_other = s:dir_this . '/foo'
-  call mkdir(s:dir_other)
+  let s:dir_foo = s:dir_this . '/foo'
+  call mkdir(s:dir_foo)
+  let s:dir_bar = s:dir_this . '/bar'
+  call mkdir(s:dir_bar)
 endfunc
 
 function s:After_test_dirchanged()
   exe 'cd' s:dir_this
-  call delete(s:dir_other, 'd')
+  call delete(s:dir_foo, 'd')
+  call delete(s:dir_bar, 'd')
   augroup test_dirchanged
     autocmd!
   augroup END
@@ -1350,10 +1353,12 @@ function Test_dirchanged_global()
   call s:Before_test_dirchanged()
   autocmd test_dirchanged DirChanged global call add(s:li, "cd:")
   autocmd test_dirchanged DirChanged global call add(s:li, expand("<afile>"))
-  exe 'cd' s:dir_other
-  call assert_equal(["cd:", s:dir_other], s:li)
-  exe 'lcd' s:dir_other
-  call assert_equal(["cd:", s:dir_other], s:li)
+  exe 'cd' s:dir_foo
+  call assert_equal(["cd:", s:dir_foo], s:li)
+  exe 'cd' s:dir_foo
+  call assert_equal(["cd:", s:dir_foo], s:li)
+  exe 'lcd' s:dir_bar
+  call assert_equal(["cd:", s:dir_foo], s:li)
   call s:After_test_dirchanged()
 endfunc
 
@@ -1361,10 +1366,12 @@ function Test_dirchanged_local()
   call s:Before_test_dirchanged()
   autocmd test_dirchanged DirChanged window call add(s:li, "lcd:")
   autocmd test_dirchanged DirChanged window call add(s:li, expand("<afile>"))
-  exe 'cd' s:dir_other
+  exe 'cd' s:dir_foo
   call assert_equal([], s:li)
-  exe 'lcd' s:dir_other
-  call assert_equal(["lcd:", s:dir_other], s:li)
+  exe 'lcd' s:dir_bar
+  call assert_equal(["lcd:", s:dir_bar], s:li)
+  exe 'lcd' s:dir_bar
+  call assert_equal(["lcd:", s:dir_bar], s:li)
   call s:After_test_dirchanged()
 endfunc
 
@@ -1379,9 +1386,9 @@ function Test_dirchanged_auto()
   set acd
   exe 'cd ..'
   call assert_equal([], s:li)
-  exe 'edit ' . s:dir_other . '/Xfile'
-  call assert_equal(s:dir_other, getcwd())
-  call assert_equal(["auto:", s:dir_other], s:li)
+  exe 'edit ' . s:dir_foo . '/Xfile'
+  call assert_equal(s:dir_foo, getcwd())
+  call assert_equal(["auto:", s:dir_foo], s:li)
   set noacd
   bwipe!
   call s:After_test_dirchanged()

test/functional/autocmd/dirchanged_spec.lua

@@ -113,6 +113,42 @@ describe('autocmd DirChanged', function()
     eq(2, eval('g:cdcount'))
   end)
 
+  it('does not trigger if diretory has not changed', function()
+    command('lcd '..dirs[1])
+    eq({cwd=dirs[1], scope='window', changed_window=false}, eval('g:ev'))
+    eq(1, eval('g:cdcount'))
+    command('let g:ev = {}')
+    command('lcd '..dirs[1])
+    eq({}, eval('g:ev'))
+    eq(1, eval('g:cdcount'))
+
+    command('tcd '..dirs[2])
+    eq({cwd=dirs[2], scope='tab', changed_window=false}, eval('g:ev'))
+    eq(2, eval('g:cdcount'))
+    command('let g:ev = {}')
+    command('tcd '..dirs[2])
+    eq({}, eval('g:ev'))
+    eq(2, eval('g:cdcount'))
+
+    command('cd '..dirs[3])
+    eq({cwd=dirs[3], scope='global', changed_window=false}, eval('g:ev'))
+    eq(3, eval('g:cdcount'))
+    command('let g:ev = {}')
+    command('cd '..dirs[3])
+    eq({}, eval('g:ev'))
+    eq(3, eval('g:cdcount'))
+
+    command('set autochdir')
+
+    command('split '..dirs[1]..'/foo')
+    eq({cwd=dirs[1], scope='window', changed_window=false}, eval('g:ev'))
+    eq(4, eval('g:cdcount'))
+    command('let g:ev = {}')
+    command('split '..dirs[1]..'/bar')
+    eq({}, eval('g:ev'))
+    eq(4, eval('g:cdcount'))
+  end)
+
   it("is triggered by switching to win/tab with different CWD #6054", function()
     command('lcd '..dirs[3])            -- window 3
     command('split '..dirs[2]..'/foo')  -- window 2