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desktop-entry-spec: Add "SingleMainWindow" key

Nate Graham requested to merge ngraham/xdg-specs:add-SingleInstance-desktop-file-key into master

This is an upstreaming of the GNOME-specific X-GNOME-SingleWindow key, which functions as the same thing, signaling that an app only supports having a single one of its main window open.

We recently added support for apps with that key in KDE [1] and thought it would be useful to upstream (with a slightly more accurate name, since technically single-instance apps can open multiple windows) so that everyone could benefit from the same thing.

[1] https://invent.kde.org/plasma/plasma-workspace/-/merge_requests/1309

Edited by Nate Graham

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