"Add to Menu" adds selections from other boxes

[ryan]

Select items in the Categories and Pages boxes. Press "Add to Menu" in one of the boxes. Selections from all boxes are added instead of just the box where "Add to Menu" is pressed. This could be handy when done intentionally, but it is unexpected.

[filosofo]

I think this is a feature, not a bug.

Also, if this behavior is changed and is consistent with non-js users, we'll need to make the meta-boxes each act as separate forms, which would differ both from current menu meta-box behavior and the behavior of meta boxes on the post object edit pages.

[nacin]

The plan is to break these into multiple forms, especially given the multiple "Add to Menu" buttons. I believe it has been determined that it isn't desired UX behavior, nor in line with the UI, which keeps these meta boxes very distinct.

[filosofo]

Makes sense.

[nacin]

[14436] -- Have 'Add to Menu' and multiple-item drag/drop only affect one meta box at a time. props ptahdunbar, with koopersmith. Non-JS will still handle the meta boxes all together as one form. see #13220, see #13219.

Leaving open for ux-feedback due to the last part. If that is acceptable (that "Add to Menu" in non-JS will add for all), then let's close as fixed.

[johnonolan]

I think it's an acceptable quirk, it doesn't render the interface unusable by any means.