bug#53762: Improve error message when during url retrieving network connection is lost

[Robert Pluim]

>>>>> On Mon, 07 Feb 2022 16:48:57 +0000, emacsq via "Bug reports for GNU 
>>>>> Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org> said:

    >> Sure, that can be done. Does the patch actually solve the problem,
    emacsq> emacsq?

    emacsq> We have information if it's a network connection: if (NETCONN_P 
(proc))

    emacsq> So using that we can improve the message. Something like:

    emacsq> if (NETCONN_P (proc))
    emacsq>   "Network error: <process> <error message>"
    emacsq> else
    emacsq>   "Process <process> not running: <error message>"

`status_message' already produces different messages based on whether
itʼs a network connection, so I donʼt think thatʼs necessary.

Have you been able to try the original patch? I now realise that
youʼre on windows, which explains why you were seeing problems
originally.

Robert
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