I select a batch of items to edit in a scriveneings window, or to copy paste and send to my sister.
But I don’t click in the editor window first before hitting command A. Or I’m coming back from another app, I click in the editor window. But that only selects the app. If my cursor was last in the binder, the binder gets the cmd - A. If I click a second time in the window, and the binder wasn’t selected, I just unselected all the text.
So I’ve just selected the entire binder, and I have to wait a bit, while it tries to assemble a few megabytes of rtf documents, plust 200 mb of research documents.
This one reason why I wish that apple had an option to show which sub-window had focus.