fix(which_key): close window on mouse click action (#3053)

* fix(which_key): close window on mouse click action

`nvim_buf_delete` is not allowed during text change or window change.
Window switching with left mouse click was leading to race
condition/error.

* [docgen] Update doc/telescope.txt
skip-checks: true

---------

Co-authored-by: Github Actions <actions@github>

lua/telescope/actions/init.lua

@@ -1428,9 +1428,11 @@ actions.which_key = function(prompt_bufnr, opts)
       buffer = close_buffer,
       once = true,
       callback = function()
-        pcall(vim.api.nvim_win_close, km_win_id, true)
-        pcall(vim.api.nvim_win_close, km_opts.border.win_id, true)
-        require("telescope.utils").buf_delete(km_buf)
+        vim.schedule(function()
+          pcall(vim.api.nvim_win_close, km_win_id, true)
+          pcall(vim.api.nvim_win_close, km_opts.border.win_id, true)
+          utils.buf_delete(km_buf)
+        end)
       end,
     })
   end)