Re: yank-media: allow users to limit image types that can be inserted

[Eli Zaretskii <eliz@gnu.org>]

> From: Robert Pluim <rpluim@gmail.com>
> Cc: visuweshm@gmail.com,  pinmacs@cas.cat,  emacs-devel@gnu.org
> Date: Mon, 23 Sep 2024 18:10:43 +0200
> 
> >>>>> On Mon, 23 Sep 2024 18:54:25 +0300, Eli Zaretskii <eliz@gnu.org> said:
> 
>     >> From: Robert Pluim <rpluim@gmail.com>
>     >> Cc: Visuwesh <visuweshm@gmail.com>,  pinmacs@cas.cat,  emacs-devel@gnu.org
>     >> Date: Mon, 23 Sep 2024 17:09:03 +0200
>     >> 
>     Eli> IMO, for users we already have what is needed: when we detect several
>     Eli> formats, we show them to the user and ask him/her to tell us which
>     Eli> format he/she wants to use.
>     >> 
>     >> But that requires user interaction. I think the original request could
>     >> be summed up as "if the list contains image/png, donʼt ask me, just
>     >> insert the image".
> 
>     Eli> That's not how I understand the request.  It was not always PNG, it
>     Eli> was "sometimes PNG, but if so-and-so-happens, the JPEG" etc.
> 
> Yes, but the "so-and-so" is determined by a user option. So
> 
> 1. Always prefer "png" -> user option == "png"
> 2. Want to choose between "png" and "jpeg" -> user option == ("png"
> "jpeg")
> 3. All of the formats -> user option == nil

That makes little sense to me: how can the user decide in advance to
use only PNG? by what logic?

And anyway, this is not what the OP said.  Let's get back to what he
said:

>     Eli> And no one has explained yet why I would prefer PNG to JPEG or vice
>     Eli> versa, btw.  The usual choices I'm familiar with is whether or not to
>     Eli> preserve typefaces, colors, and other fancy attributes; regarding
>     Eli> images, there's just a decision whether you want to paste the material
>     Eli> as a picture or as some kind of text, whether rich or not.  So the
>     Eli> background and the context for this request is still not clear to me.
> 
> I can definitely see a use for case 1 above: "donʼt bother asking me,
> if png is available just use that".

I don't understand why would someone define their preference in the
terms of image format.  It makes no sense.