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bug#49504: Server support for Freedesktop.org startup notification

From: Peter Oliver
Subject: bug#49504: Server support for Freedesktop.org startup notification
Date: Sat, 10 Jul 2021 12:43:39 +0100 (BST)

For a desktop environment, it’s helpful to know which execs caused which 
windows to be opened.  One way of doing this is with the Freedesktop.org 
startup notification protocol, 

We currently partially support this protocol in GTK builds, because GTK handles 
it for us automatically.  However, GTK can only automatically handle the simple 
case where emacs is launched and displays a window itself.

To support emacsclient, where the execed process is not necessarily an ancestor 
of the process displaying the window, as I understand it we’d need to do the 

- Pass the value of the DESKTOP_STARTUP_ID environment variable from 
emacsclient to emacs.
- When opening a new frame at the request of emacsclient, call C function 
gtk_window_set_startup_id with the value from DESKTOP_STARTUP_ID.

Peter Oliver

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