fix: action mt so we can again concat actions from two different tables (#1143)

* fix: action mt so we can again concat actions from two different tables

- without actually changing the public interface
- without having a local table that keeps track of all actions

* this should clear actions now

we never actually called this function which is kinda a problem because
we never cleaned up previous mapping stores.
We can also make a better mappings store which has access to the keys
sequences which would help the showing actions part

* bugfix

* that should now clear everything

only tests left i think

* more tests

* cleanup

* hack: make sure all actions get cleared

lua/telescope/mappings.lua

@@ -221,10 +221,6 @@ mappings.apply_keymap = function(prompt_bufnr, attach_mappings, buffer_keymap)
       end
     end
   end
-
-  vim.cmd(
-    string.format([[autocmd BufDelete %s :lua require('telescope.mappings').clear(%s)]], prompt_bufnr, prompt_bufnr)
-  )
 end
 
 mappings.execute_keymap = function(prompt_bufnr, keymap_identifier)
@@ -237,6 +233,12 @@ mappings.execute_keymap = function(prompt_bufnr, keymap_identifier)
 end
 
 mappings.clear = function(prompt_bufnr)
+  require("telescope.actions.mt").clear_all()
+  -- TODO(conni2461): This seems like the better solution but it won't clear actions that were never mapped
+  -- for _, v in ipairs(keymap_store[prompt_bufnr]) do
+  --   pcall(v.clear)
+  -- end
+
   keymap_store[prompt_bufnr] = nil
 end