From 3198038224209c41932a305e2a2dee708d4e3ec8 Mon Sep 17 00:00:00 2001
From: altermo <107814000+altermo@users.noreply.github.com>
Date: Tue, 7 Nov 2023 01:33:38 +0100
Subject: [PATCH] fix(lua): correct return value for on_key with no arguments
 (#25911)

---
 runtime/lua/vim/_editor.lua      | 2 +-
 test/functional/lua/vim_spec.lua | 6 ++++++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/runtime/lua/vim/_editor.lua b/runtime/lua/vim/_editor.lua
index 0da127b18f..0bdf0c90a5 100644
--- a/runtime/lua/vim/_editor.lua
+++ b/runtime/lua/vim/_editor.lua
@@ -650,7 +650,7 @@ local on_key_cbs = {}
 ---if on_key() is called without arguments.
 function vim.on_key(fn, ns_id)
   if fn == nil and ns_id == nil then
-    return #on_key_cbs
+    return vim.tbl_count(on_key_cbs)
   end
 
   vim.validate({
diff --git a/test/functional/lua/vim_spec.lua b/test/functional/lua/vim_spec.lua
index c69990d84b..1ebfa9dd1d 100644
--- a/test/functional/lua/vim_spec.lua
+++ b/test/functional/lua/vim_spec.lua
@@ -2438,6 +2438,12 @@ describe('lua stdlib', function()
     end)
 
     it('allows removing on_key listeners', function()
+      -- Create some unused namespaces
+      meths.create_namespace('unused1')
+      meths.create_namespace('unused2')
+      meths.create_namespace('unused3')
+      meths.create_namespace('unused4')
+
       insert([[hello world]])
 
       exec_lua [[