[FR]: "Edit feed of selected article" option when right-clicking an article

[RetroAbstract]

Brief description of the feature request

This feature would allow the user to make changes to a feed upon right clicking an article and clicking "Edit feed of selected article":

RSS Guard would open the usual feed edit window, and also navigate & highlight the relevant feed in the feed list:

Additionaly, you would also be able to assign a shortcut key to "Edit feed of selected article".

Thanks!