fix(telescope.state.get_existing_prompts): it should only return keys…

… that are numbers (#2684)

* fix(telescope.state.get_existing_prompts): it should only return keys that are numbers

* Table keys not table values should be numbers

* Rename get_existing_prompts to get_existing_prompt_bufnrs and make the impl more efficient

(cherry picked from commit 20a37e4)

lua/telescope/pickers.lua

@@ -1223,7 +1223,7 @@ end
 
 --- Close all open Telescope pickers
 function Picker:close_existing_pickers()
-  for _, prompt_bufnr in ipairs(state.get_existing_prompts()) do
+  for _, prompt_bufnr in ipairs(state.get_existing_prompt_bufnrs()) do
     pcall(actions.close, prompt_bufnr)
   end
 end

lua/telescope/state.lua

@@ -24,8 +24,16 @@ function state.clear_status(prompt_bufnr)
   state.set_status(prompt_bufnr, nil)
 end
 
-function state.get_existing_prompts()
-  return vim.tbl_keys(TelescopeGlobalState)
+function state.get_existing_prompt_bufnrs()
+  local prompt_bufnrs = {}
+
+  for key, _ in pairs(TelescopeGlobalState) do
+    if type(key) == "number" then
+      table.insert(prompt_bufnrs, key)
+    end
+  end
+
+  return prompt_bufnrs
 end
 
 return state