bug#51473: [PATCH] Enable xwidget scrolling optimizations, and other xwidgets improvements

[Eli Zaretskii]

> From: Po Lu <luangruo@yahoo.com>
> Cc: Eli Zaretskii <eliz@gnu.org>,  51473@debbugs.gnu.org
> Date: Sun, 07 Nov 2021 08:41:15 +0800
> 
> Lars Ingebrigtsen <larsi@gnus.org> writes:
> 
> > I can test both, but it'd be easier to test if it was just one huge
> > patch.  (When applying for real, we can apply the patch series.)  So can
> > you post this series as one patch?
> 
> Thanks, here you go.

> --- a/src/print.c
> +++ b/src/print.c
> @@ -1521,8 +1521,20 @@ print_vectorlike (Lisp_Object obj, Lisp_Object 
> printcharfun, bool escapeflag,
>        printchar ('>', printcharfun);
>        break;
>  
> -    case PVEC_XWIDGET: case PVEC_XWIDGET_VIEW:
> -      print_c_string ("#<xwidget ", printcharfun);
> +    case PVEC_XWIDGET:
> +#ifdef HAVE_XWIDGETS
> +      {
> +     int len = sprintf (buf, "#<xwidget %u %p>",
> +                        XXWIDGET (obj)->xwidget_id,
> +                        XXWIDGET (obj)->widget_osr);
> +     strout (buf, len, len, printcharfun);
> +     break;
> +      }

The printed representation of xwidget objects should be documented in
the ELisp manual, under the "Editing Types" section.  In fact, we lack
a subsection there for xwidgets; it should be added.

Thanks.