fix: no longer leaking one buffer previewer in some occasions (#664)

* fix: stop leaking last preview buffer
* fix: formatting for docs
* fix: async check if file is dir or not and
  - fix for in_fast_event when overriding file_maker
* fix: filtering for space in keymaps and fzy
* fix: show correct result numbers when using file_ignore_patterns
* Handle early close. Caused because we actually cleaning up buffers now
* cleanup
* [docgen] Update doc/telescope.txt

lua/telescope/builtin/internal.lua

@@ -683,7 +683,7 @@ internal.keymaps = function(opts)
         return {
           valid = line ~= "",
           value = line,
-          ordinal = line.lhs .. line.rhs,
+          ordinal = utils.display_termcodes(line.lhs) .. line.rhs,
           display = line.mode .. ' ' .. utils.display_termcodes(line.lhs) .. ' ' .. line.rhs
         }
       end