Re-reading history from ZLE

[martin f krafft <madduck@madduck.net>]

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Folks,

If a user widget modifies the history, e.g. appends a line using 
`print -s`, then the current ZLE instance does not find out about 
it: history expansion won't have access to it, and the `up-history` 
command doesn't "find" it.

```
% _test_hist() {
     print -s "echo foo"
     zle -M "The last line of history is now 'echo foo'
     zle reset-prompt
   }
% zle -N _test_hist
% bindkey '\et' _test_hist

   # now hit esc-t
% _
The last line of history is now 'echo foo'
```

The cursor is indicated by the underscore. If I execute 
`up-history`, I get the `bindkey` command line. `!$` will contain 
"_test_hist". Curiously, `!!` will run `echo foo`. I suspect this is 
due to those being different ways to access history for historical 
reasons, but it's an inconsistency nonetheless.

Is there a reason why `reset-prompt` shouldn't re-initialise ZLE's 
understanding of history?

Thanks,

-- 
@martinkrafft | https://matrix.to/#/#madduck:madduck.net
  
"the worst part of being old is remembering when you was young."
                               -- alvin straight (the straight story)
  
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