Wayland app_id empty

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Issue Type

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• Bug Report

• Feature Request

• Successfully reproduced against the latest version of NW.js?

Current/Missing Behavior

On Wayland, app_id must be available for desktop environments to match an application to its desktop file for things like icons etc to be resolvable. The property is similar to WM_CLASS for X11, and indeed must map 1:1 to the .desktop basename, and to the StartupWMClass property within the .desktop file when it exists.

Expected/Proposed Behavior

nw.js applications should return an app_id

Additional Info

Here is an example of how Electron solved this:

electron/electron#34855

• Operating System: Arch Linux
• NW.js Version: 78.1