vim-patch:8.1.0815: dialog for file changed outside of Vim not tested (#28184)

Problem:    Dialog for file changed outside of Vim not tested.
Solution:   Add a test.  Move FileChangedShell test.  Add 'L' flag to
            feedkeys().

https://github.com/vim/vim/commit/5e66b42aae7c67a3ef67617d4bd43052ac2b73ce

Co-authored-by: Bram Moolenaar <Bram@vim.org>

12 files changed, 30 insertions, 234 deletions

diff --git a/runtime/doc/builtin.txt b/runtime/doc/builtin.txt
index c88513ad75..20cdb396e1 100644
--- a/runtime/doc/builtin.txt
+++ b/runtime/doc/builtin.txt
@@ -1588,6 +1588,7 @@ feedkeys({string} [, {mode}])                                       *feedkeys()*
 		't'	Handle keys as if typed; otherwise they are handled as
 			if coming from a mapping.  This matters for undo,
 			opening folds, etc.
+		'L'	Lowlevel input.  Other flags are not used.
 		'i'	Insert the string instead of appending (see above).
 		'x'	Execute commands until typeahead is empty.  This is
 			similar to using ":normal!".  You can call feedkeys()
diff --git a/runtime/lua/vim/_meta/vimfn.lua b/runtime/lua/vim/_meta/vimfn.lua
index caddd4dde2..887c4b3cbe 100644
--- a/runtime/lua/vim/_meta/vimfn.lua
+++ b/runtime/lua/vim/_meta/vimfn.lua
@@ -1959,6 +1959,7 @@ function vim.fn.extendnew(expr1, expr2, expr3) end
 --- 't'  Handle keys as if typed; otherwise they are handled as
 ---   if coming from a mapping.  This matters for undo,
 ---   opening folds, etc.
+--- 'L'  Lowlevel input.  Other flags are not used.
 --- 'i'  Insert the string instead of appending (see above).
 --- 'x'  Execute commands until typeahead is empty.  This is
 ---   similar to using ":normal!".  You can call feedkeys()
diff --git a/src/nvim/api/vim.c b/src/nvim/api/vim.c
index 2fb8f3d554..82e9ddff2d 100644
--- a/src/nvim/api/vim.c
+++ b/src/nvim/api/vim.c
@@ -277,6 +277,7 @@ void nvim_feedkeys(String keys, String mode, Boolean escape_ks)
   bool typed = false;
   bool execute = false;
   bool dangerous = false;
+  bool lowlevel = false;
 
   for (size_t i = 0; i < mode.size; i++) {
     switch (mode.data[i]) {
@@ -292,6 +293,8 @@ void nvim_feedkeys(String keys, String mode, Boolean escape_ks)
       execute = true; break;
     case '!':
       dangerous = true; break;
+    case 'L':
+      lowlevel = true; break;
     }
   }
 
@@ -307,10 +310,14 @@ void nvim_feedkeys(String keys, String mode, Boolean escape_ks)
   } else {
     keys_esc = keys.data;
   }
-  ins_typebuf(keys_esc, (remap ? REMAP_YES : REMAP_NONE),
-              insert ? 0 : typebuf.tb_len, !typed, false);
-  if (vgetc_busy) {
-    typebuf_was_filled = true;
+  if (lowlevel) {
+    input_enqueue_raw(cstr_as_string(keys_esc));
+  } else {
+    ins_typebuf(keys_esc, (remap ? REMAP_YES : REMAP_NONE),
+                insert ? 0 : typebuf.tb_len, !typed, false);
+    if (vgetc_busy) {
+      typebuf_was_filled = true;
+    }
   }
 
   if (escape_ks) {
diff --git a/src/nvim/eval.lua b/src/nvim/eval.lua
index 6a3eabc467..e40e81f8f2 100644
--- a/src/nvim/eval.lua
+++ b/src/nvim/eval.lua
@@ -2481,6 +2481,7 @@ M.funcs = {
       't'	Handle keys as if typed; otherwise they are handled as
       	if coming from a mapping.  This matters for undo,
       	opening folds, etc.
+      'L'	Lowlevel input.  Other flags are not used.
       'i'	Insert the string instead of appending (see above).
       'x'	Execute commands until typeahead is empty.  This is
       	similar to using ":normal!".  You can call feedkeys()
diff --git a/src/nvim/message.c b/src/nvim/message.c
index 68a8b8e88b..362dc2c05a 100644
--- a/src/nvim/message.c
+++ b/src/nvim/message.c
@@ -3395,9 +3395,7 @@ int do_dialog(int type, const char *title, const char *message, const char *butt
   int retval = 0;
   int i;
 
-  if (silent_mode      // No dialogs in silent mode ("ex -s")
-      || !ui_active()  // Without a UI Nvim waits for input forever.
-      ) {
+  if (silent_mode) {  // No dialogs in silent mode ("ex -s")
     return dfltbutton;  // return default option
   }
 
@@ -3414,6 +3412,12 @@ int do_dialog(int type, const char *title, const char *message, const char *butt
   char *hotkeys = msg_show_console_dialog(message, buttons, dfltbutton);
 
   while (true) {
+    // Without a UI Nvim waits for input forever.
+    if (!ui_active() && !input_available()) {
+      retval = dfltbutton;
+      break;
+    }
+
     // Get a typed character directly from the user.
     int c = get_keystroke(NULL);
     switch (c) {
diff --git a/src/nvim/os/input.c b/src/nvim/os/input.c
index 5218e50df6..60b5b48745 100644
--- a/src/nvim/os/input.c
+++ b/src/nvim/os/input.c
@@ -247,6 +247,13 @@ bool os_isatty(int fd)
   return uv_guess_handle(fd) == UV_TTY;
 }
 
+void input_enqueue_raw(String keys)
+{
+  if (keys.size > 0) {
+    rbuffer_write(input_buffer, keys.data, keys.size);
+  }
+}
+
 size_t input_enqueue(String keys)
 {
   const char *ptr = keys.data;
diff --git a/test/functional/legacy/buffer_spec.lua b/test/functional/legacy/buffer_spec.lua
deleted file mode 100644
index b3964540f0..0000000000
--- a/test/functional/legacy/buffer_spec.lua
+++ /dev/null
@@ -1,59 +0,0 @@
-local helpers = require('test.functional.helpers')(after_each)
-local clear, source = helpers.clear, helpers.source
-local call, eq, api = helpers.call, helpers.eq, helpers.api
-
-local function expected_empty()
-  eq({}, api.nvim_get_vvar('errors'))
-end
-
-describe('buffer', function()
-  before_each(function()
-    clear()
-    api.nvim_ui_attach(80, 24, {})
-    api.nvim_set_option_value('hidden', false, {})
-  end)
-
-  it('deleting a modified buffer with :confirm', function()
-    source([[
-      func Test_bdel_with_confirm()
-        new
-        call setline(1, 'test')
-        call assert_fails('bdel', 'E89:')
-        call nvim_input('c')
-        confirm bdel
-        call assert_equal(2, winnr('$'))
-        call assert_equal(1, &modified)
-        call nvim_input('n')
-        confirm bdel
-        call assert_equal(1, winnr('$'))
-      endfunc
-    ]])
-    call('Test_bdel_with_confirm')
-    expected_empty()
-  end)
-
-  it('editing another buffer from a modified buffer with :confirm', function()
-    source([[
-      func Test_goto_buf_with_confirm()
-        new Xfile
-        enew
-        call setline(1, 'test')
-        call assert_fails('b Xfile', 'E37:')
-        call nvim_input('c')
-        call assert_fails('confirm b Xfile', 'E37:')
-        call assert_equal(1, &modified)
-        call assert_equal('', @%)
-        call nvim_input('y')
-        call assert_fails('confirm b Xfile', 'E37:')
-        call assert_equal(1, &modified)
-        call assert_equal('', @%)
-        call nvim_input('n')
-        confirm b Xfile
-        call assert_equal('Xfile', @%)
-        close!
-      endfunc
-    ]])
-    call('Test_goto_buf_with_confirm')
-    expected_empty()
-  end)
-end)
diff --git a/test/functional/legacy/filechanged_spec.lua b/test/functional/legacy/filechanged_spec.lua
deleted file mode 100644
index 46ecfdcd63..0000000000
--- a/test/functional/legacy/filechanged_spec.lua
+++ /dev/null
@@ -1,142 +0,0 @@
-local helpers = require('test.functional.helpers')(after_each)
-local clear, source = helpers.clear, helpers.source
-local call, eq, api = helpers.call, helpers.eq, helpers.api
-local is_os = helpers.is_os
-local skip = helpers.skip
-
-local function expected_empty()
-  eq({}, api.nvim_get_vvar('errors'))
-end
-
-describe('file changed dialog', function()
-  before_each(function()
-    clear()
-    api.nvim_ui_attach(80, 24, {})
-    api.nvim_set_option_value('autoread', false, {})
-    api.nvim_set_option_value('fsync', true, {})
-  end)
-
-  it('works', function()
-    skip(is_os('win'))
-    source([[
-      func Test_file_changed_dialog()
-        au! FileChangedShell
-
-        new Xchanged_d
-        call setline(1, 'reload this')
-        write
-        " Need to wait until the timestamp would change by at least a second.
-        sleep 2
-        silent !echo 'extra line' >>Xchanged_d
-        call nvim_input('L')
-        checktime
-        call assert_match('W11:', v:warningmsg)
-        call assert_equal(2, line('$'))
-        call assert_equal('reload this', getline(1))
-        call assert_equal('extra line', getline(2))
-
-        " delete buffer, only shows an error, no prompt
-        silent !rm Xchanged_d
-        checktime
-        call assert_match('E211:', v:warningmsg)
-        call assert_equal(2, line('$'))
-        call assert_equal('extra line', getline(2))
-        let v:warningmsg = 'empty'
-
-        " change buffer, recreate the file and reload
-        call setline(1, 'buffer is changed')
-        silent !echo 'new line' >Xchanged_d
-        call nvim_input('L')
-        checktime
-        call assert_match('W12:', v:warningmsg)
-        call assert_equal(1, line('$'))
-        call assert_equal('new line', getline(1))
-
-        " Only mode changed, reload
-        silent !chmod +x Xchanged_d
-        call nvim_input('L')
-        checktime
-        call assert_match('W16:', v:warningmsg)
-        call assert_equal(1, line('$'))
-        call assert_equal('new line', getline(1))
-
-        " Only time changed, no prompt
-        sleep 2
-        silent !touch Xchanged_d
-        let v:warningmsg = ''
-        checktime Xchanged_d
-        call assert_equal('', v:warningmsg)
-        call assert_equal(1, line('$'))
-        call assert_equal('new line', getline(1))
-
-        " File created after starting to edit it
-        call delete('Xchanged_d')
-        new Xchanged_d
-        call writefile(['one'], 'Xchanged_d')
-        call nvim_input('L')
-        checktime Xchanged_d
-        call assert_equal(['one'], getline(1, '$'))
-        close!
-
-        bwipe!
-        call delete('Xchanged_d')
-      endfunc
-    ]])
-    call('Test_file_changed_dialog')
-    expected_empty()
-  end)
-
-  it('works with FileChangedShell', function()
-    source([[
-      func Test_FileChangedShell_edit_dialog()
-        new Xchanged_r
-        call setline(1, 'reload this')
-        set fileformat=unix
-        silent write  " Use :silent to prevent a hit-enter prompt
-
-        " File format changed, reload (content only) via prompt
-        augroup testreload
-          au!
-          au FileChangedShell Xchanged_r let g:reason = v:fcs_reason | let v:fcs_choice = 'ask'
-        augroup END
-        call assert_equal(&fileformat, 'unix')
-        sleep 10m  " make the test less flaky in Nvim
-        call writefile(["line1\r", "line2\r"], 'Xchanged_r')
-        let g:reason = ''
-        call nvim_input('L') " load file content only
-        checktime
-        call assert_equal('changed', g:reason)
-        call assert_equal(&fileformat, 'unix')
-        call assert_equal("line1\r", getline(1))
-        call assert_equal("line2\r", getline(2))
-        %s/\r
-        silent write  " Use :silent to prevent a hit-enter prompt
-
-        " File format changed, reload (file and options) via prompt
-        augroup testreload
-          au!
-          au FileChangedShell Xchanged_r let g:reason = v:fcs_reason | let v:fcs_choice = 'ask'
-        augroup END
-        call assert_equal(&fileformat, 'unix')
-        sleep 10m  " make the test less flaky in Nvim
-        call writefile(["line1\r", "line2\r"], 'Xchanged_r')
-        let g:reason = ''
-        call nvim_input('a') " load file content and options
-        checktime
-        call assert_equal('changed', g:reason)
-        call assert_equal(&fileformat, 'dos')
-        call assert_equal("line1", getline(1))
-        call assert_equal("line2", getline(2))
-        set fileformat=unix
-        silent write  " Use :silent to prevent a hit-enter prompt
-
-        au! testreload
-        bwipe!
-        call delete(undofile('Xchanged_r'))
-        call delete('Xchanged_r')
-      endfunc
-    ]])
-    call('Test_FileChangedShell_edit_dialog')
-    expected_empty()
-  end)
-end)
diff --git a/test/functional/vimscript/input_spec.lua b/test/functional/vimscript/input_spec.lua
index b749d5a7f0..d64ae3b0f1 100644
--- a/test/functional/vimscript/input_spec.lua
+++ b/test/functional/vimscript/input_spec.lua
@@ -8,7 +8,6 @@ local clear = helpers.clear
 local source = helpers.source
 local command = helpers.command
 local exc_exec = helpers.exc_exec
-local pcall_err = helpers.pcall_err
 local async_meths = helpers.async_meths
 local NIL = vim.NIL
 
@@ -407,7 +406,6 @@ describe('inputdialog()', function()
 end)
 
 describe('confirm()', function()
-  -- oldtest: Test_confirm()
   it('works', function()
     api.nvim_set_option_value('more', false, {}) -- Avoid hit-enter prompt
     api.nvim_set_option_value('laststatus', 2, {})
@@ -470,20 +468,6 @@ describe('confirm()', function()
       screen:expect({ any = '%[No Name%]' })
       eq(1, api.nvim_get_var('a'))
     end
-
-    eq('Vim(call):E730: Using a List as a String', pcall_err(command, 'call confirm([])'))
-    eq(
-      'Vim(call):E730: Using a List as a String',
-      pcall_err(command, 'call confirm("Are you sure?", [])')
-    )
-    eq(
-      'Vim(call):E745: Using a List as a Number',
-      pcall_err(command, 'call confirm("Are you sure?", "&Yes\n&No\n", [])')
-    )
-    eq(
-      'Vim(call):E730: Using a List as a String',
-      pcall_err(command, 'call confirm("Are you sure?", "&Yes\n&No\n", 0, [])')
-    )
   end)
 
   it('shows dialog even if :silent #8788', function()
diff --git a/test/old/testdir/test_buffer.vim b/test/old/testdir/test_buffer.vim
index bb8394997d..f2a5a228b8 100644
--- a/test/old/testdir/test_buffer.vim
+++ b/test/old/testdir/test_buffer.vim
@@ -232,8 +232,6 @@ endfunc
 
 " Test for deleting a modified buffer with :confirm
 func Test_bdel_with_confirm()
-  " requires a UI to be active
-  throw 'Skipped: use test/functional/legacy/buffer_spec.lua'
   CheckUnix
   CheckNotGui
   CheckFeature dialog_con
@@ -251,8 +249,6 @@ endfunc
 
 " Test for editing another buffer from a modified buffer with :confirm
 func Test_goto_buf_with_confirm()
-  " requires a UI to be active
-  throw 'Skipped: use test/functional/legacy/buffer_spec.lua'
   CheckUnix
   CheckNotGui
   CheckFeature dialog_con
diff --git a/test/old/testdir/test_filechanged.vim b/test/old/testdir/test_filechanged.vim
index fef0eb732f..b9f8d4c37a 100644
--- a/test/old/testdir/test_filechanged.vim
+++ b/test/old/testdir/test_filechanged.vim
@@ -140,8 +140,6 @@ func Test_FileChangedShell_edit()
 endfunc
 
 func Test_FileChangedShell_edit_dialog()
-  " requires a UI to be active
-  throw 'Skipped: use test/functional/legacy/filechanged_spec.lua'
   CheckNotGui
   CheckUnix  " Using low level feedkeys() does not work on MS-Windows.
 
@@ -156,6 +154,7 @@ func Test_FileChangedShell_edit_dialog()
     au FileChangedShell Xchanged_r let g:reason = v:fcs_reason | let v:fcs_choice = 'ask'
   augroup END
   call assert_equal(&fileformat, 'unix')
+  sleep 10m  " make the test less flaky in Nvim
   call writefile(["line1\r", "line2\r"], 'Xchanged_r')
   let g:reason = ''
   call feedkeys('L', 'L') " load file content only
@@ -173,6 +172,7 @@ func Test_FileChangedShell_edit_dialog()
     au FileChangedShell Xchanged_r let g:reason = v:fcs_reason | let v:fcs_choice = 'ask'
   augroup END
   call assert_equal(&fileformat, 'unix')
+  sleep 10m  " make the test less flaky in Nvim
   call writefile(["line1\r", "line2\r"], 'Xchanged_r')
   let g:reason = ''
   call feedkeys('a', 'L') " load file content and options
@@ -191,8 +191,6 @@ func Test_FileChangedShell_edit_dialog()
 endfunc
 
 func Test_file_changed_dialog()
-  " requires a UI to be active
-  throw 'Skipped: use test/functional/legacy/filechanged_spec.lua'
   CheckUnix
   CheckNotGui
   au! FileChangedShell
diff --git a/test/old/testdir/test_functions.vim b/test/old/testdir/test_functions.vim
index fdcd93a264..ea0e3790cc 100644
--- a/test/old/testdir/test_functions.vim
+++ b/test/old/testdir/test_functions.vim
@@ -2590,8 +2590,6 @@ endfunc
 
 " Test confirm({msg} [, {choices} [, {default} [, {type}]]])
 func Test_confirm()
-  " requires a UI to be active
-  throw 'Skipped: use test/functional/vimscript/input_spec.lua'
   CheckUnix
   CheckNotGui