[PATCH] org.el: Avoid xdg-open silent failure

[Maxim Nikulin]

On 31/01/2021 23:33, Eli Zaretskii wrote:
> > From: Maxim Nikulin <m.a.nikulin@gmail.com>
> > Date: Sun, 31 Jan 2021 22:57:57 +0700
> > Cc: 44824@debbugs.gnu.org
> >
> > > > To fix the problem it is better to use (make-process :connection-type
> > > > 'pipe ...) that unfortunately has no higher level wrappers.
> > >
> > > Wouldn't it work to let-bind process-connection-type to nil around the
> > > function that starts the async subprocess?
> >
> > Sorry, for me it easier to reason how to express it in terms of system
> > calls and terminal process groups than if let-bind could override a
> > variable when lexical-bind is set to true.
>
> Well, I think we should try this, because if it works, it will show us
> a way to fix the problem.  (I don't see how lexical-binding could
> interfere with let-binding.)

I have prepared a patch that uses `make-process'. I hope, error 
reporting is improved a bit, but in the case of this particular problem 
failure is still quiet since xdg-open exits successfully.

I could not estimate effect of such change on windows, so pipe process
is used only on linux. I am unsure concerning mac however.

Another question is if failure message should be suppressed when 
`waiting-for-user-input-p' returns truth to keep user prompt and input 
unaffected.

open-file-pipe-process.patch
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