[Export] - option to export only current/selected track

[Volodymyr-13]

Often, when I'm creating a new route, I also have several other .gpx files open. However, when I finish editing my current route, I only want to export that specific one. It seems illogical that all opened tracks are exported by default now.

It would be more logical for the export function to work the opposite way: exporting only the selected track by default. If needed, an option to export all tracks at once could be added, but in my experience, I always export only one track at a time. I've never exported more than one track simultaneously.