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This PR is an alternative implementation for Linux, that uses xdg-desktop-portal so that the "native" file dialog is displayed. (In practice, this is either GTK or KDE; xfce doesn't have a portal backend implementation.) It makes D-Bus API calls directly. This should work if the user has xdg-desktop-portal and a suitable backend (either xdg-desktop-portal-gtk or xdg-desktop-portal-kde) installed (which apparently is the case for all common desktop Linux distributions), but will fail with NFD_ERROR otherwise.
This implementation links with D-Bus (dbus-1) instead of of GTK (gtk+-3.0).
Closes #24. Also refer to mlabbe/nativefiledialog#40.