How to create custom launcher in gnome desktop

@mesiment any idea why this command is now missing?

Yes, in summary, this was removed by upstream (gnome-panel@758b548a). Once we moved to gnome-panel-3.32.0, we picked the previously mentioned commit which removes this tool.

NEWS file for gnome-panel-3.32.0 states the following:

Version 3.32.0
==============
- Fix some compiler warnings.
- Fix some deprecation warnings.
- Turn old main menu object into applet.
- Turn old menu button object into applet.
- Remove gnome-desktop-item-edit application.
- Updated translations:
  Alan Mortensen (da), Anders Jonsson (sv), Balázs Úr (hu),
  Daniel Mustieles (es), Marek Cernocky (cs), Марко М. Костић (sr),
  Matej Urbančič (sl), Nathan Follens (nl), Kukuh Syafaat (id),
  Mario Blättermann (de), Piotr Drąg (pl), Rafael Fontenelle (pt_BR),
  Stas Solovey (ru).
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