If a user opens Mp3tag without files or just does not select any, many entries from the menus become inaccessible. And that is indicated by them being grayed out
But if such entry has its own entries [i.e. serves as a sub-menu], then it is accessible and as such in full view, with only its child entries being inaccessible / grayed out. This exception is experienced in case of
Disabling the submenu anchor would mean that you cannot open the submenu and therefore not see what is in the submenu.
So I think that an enabled submenu anchor represents accurately the state of its function.
Do you know any other application that shows a different behaviour in this respect as you claim that this is
I just had a look at LibreOffice Writer and that features a number of submenu anchors that are enabled although none of the functions in the submenu is enabled - which means that this program behaves just like MP3tag.
It would be interesting to see what the first application hides in the submenu "Image rotation", and why "Analysis" is still enabled, the second appliction shows "Acquire Image" with an enabled submenu and for the 3rd I don't know if there are any "Repair" tools defined or nothing has been added yet.
And it is this uncertainty that can easily be turned into knowledge with enabled submenu anchors.
Also, your examples show that apparently it is possible to have both, enabled and disabled submenu anchors and that this way of implementation is no
neither in MP3tag nor in other applications.
leads nowhere, IMHO. you have seen that
has implemented it in this way - and an implementation does not happen randomly or accidentally it has to be