bug#51658: [PATCH] Haiku port (again)

[Eli Zaretskii]

> From: Po Lu <luangruo@yahoo.com>
> Cc: 51658@debbugs.gnu.org
> Date: Sun, 14 Nov 2021 18:39:04 +0800
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > How is POSITION used?  Can't you fake POSITION, so we get the same
> > event as on other platforms?
> 
> AFAIU, POSITION is used to determine the window where the file should
> appear.  It should be possible to fake.
> 
> We could get the mouse position on-screen, but it may lead to odd
> results if the user asks Emacs to open a file through the Tracker or the
> Recents menu, and the mouse is not on top of an Emacs frame, or if the
> system starts Emacs to open a file.
> 
> What position do you think would be reasonable to report here?

The position in a window where your current code visits the file, I
guess?  Because this feature already works in your modified Emacs,
right?

> BTW, it seems that the NS port has the same problem here: it defines the
> custom events `ns-open-file' and `ns-drag-and-drop' and `ns-power-off'.

Which is BAAAAD!

> > Every modern system has something similar, so it would make sense to
> > have a unified mechanism for handling those system messages in Emacs.
> > If xsmfns.c is too X-specific, we should build a layer above it, and
> > then implement th lower layer for Haiku.  It makes no sense to me to
> > introduce new events for specific platforms when similar features
> > already exist and just need to be extended or abstracted.
> 
> Yes, makes sense.  It would be worthwhile just to solve this problem
> with the NS port.  I will look into it.

Thanks.