Why

I was getting confused while working with add-on configs, files, etc. often clicking the buttons without having any add-ons selected, and getting the please_select_a_single_addon_first pop-up. Perhaps this could improve the usability of the dialog, if buttons were only clickable when clicking them would lead to a useful action.

How

1. Added itemSelectionChanged handler because it is also triggered on empty selection, etc.
2. Left currentRowChanged handler to preserve the hook’s behavior. But moved the button-disabling logic to the new handler.
3. Upon selection state change, disabling the 3 buttons, enabling “View Files” for empty selection, and enabling all 3 buttons when only 1 add-on is selected (still checking if the add-on has Page and Config).

Note that now it would theoretically be possible to remove the onlyOneSelected function. 📝

I hope, my code is not too sloppy (and I am sorry for doing multiple things, like adding the Cmd+W shortcut, in the same PR). Big thanks to the Anki team for all their effort! 🙌

Before:

Note that when multiple add-ons are selected, the state of Page and Config buttons depends on which add-on is the first among the selected ones.

After: