refactor(mappings)!: mapblock_fill_dict() use API Dictionary (#20020)

This introduces the following breaking changes:
- nvim_get_keymap now always returns a LuaRef object as "callback" for a
  Lua mapping regardless of how it is called. The LuaRef object can be
  called from Lua and Vim script, but is lost over RPC.
- maparg() now returns a Funcref instead of a ref number as "callback"
  for a Lua mapping. The Funcref can be called from Lua and Vim script,
  but is lost over RPC.

This may also make nvim_get_keymap faster, but make maparg() slower.

1 files changed, 2 insertions, 2 deletions

diff --git a/src/nvim/api/vim.c b/src/nvim/api/vim.c
index a1721d433f..9e1f2dd631 100644
--- a/src/nvim/api/vim.c
+++ b/src/nvim/api/vim.c
@@ -1421,10 +1421,10 @@ Dictionary nvim_get_mode(void)
 /// @param  mode       Mode short-name ("n", "i", "v", ...)
 /// @returns Array of |maparg()|-like dictionaries describing mappings.
 ///          The "buffer" key is always zero.
-ArrayOf(Dictionary) nvim_get_keymap(uint64_t channel_id, String mode)
+ArrayOf(Dictionary) nvim_get_keymap(String mode)
   FUNC_API_SINCE(3)
 {
-  return keymap_array(mode, NULL, channel_id == LUA_INTERNAL_CALL);
+  return keymap_array(mode, NULL);
 }
 
 /// Sets a global |mapping| for the given mode.