Merge pull request #25921 from neovim/backport-25911-to-release-0.9

[Backport release-0.9] fix(lua): correct return value for on_key with no arguments

runtime/lua/vim/_editor.lua

@@ -544,7 +544,7 @@ local on_key_cbs = {}
 ---@note {fn} will receive the keys after mappings have been evaluated
 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({

test/functional/lua/vim_spec.lua

@@ -2339,6 +2339,12 @@ 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 [[