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>

4 files changed, 26 insertions, 7 deletions

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;