>>> With this patch the following case works correctly in test.heex:
>>> 
>>>  <%= if true do %>
>>>    <p>hello, tree-sitter!</p>
>>>  <% end| %>
>>> 
>>> With point at "|" the command 'backward-sexp' (C-M-b)
>>> correctly jumps to the beginning of "if".
>>
>> Right.  I think it can be done in backward-sexp since there we know
>> we’re moving back.  I assume that’s what you mean.
>
> The problem is that the last time when the arg is still -1
> is in 'treesit-forward-sexp', and then it calls
> 'treesit-beginning-of-thing' with '(abs arg)'.
>
> The complete call chain:
>
> - treesit-forward-sexp
> - treesit-beginning-of-thing
> - treesit-navigate-thing
> - treesit-thing-at
> - treesit-node-at
> - treesit-parsers-at
> - overlays-at
>
> So not clear how to propagate the flag for decrementing the offset.
> Maybe by let-binding a new dynamically bound variable?

Ok, here is the patch: