At small viewports when there is no menu, the Media Modal title down arrow should not appear

[gcorne]

At small viewports when there is no menu, the Media Modal title down arrow should not appear, the title should probably be dark gray instead of blue, and the cursor should also not be a pointer.

[celloexpressions]

Not sure what the best approach is here - there currently aren't any classes or anything to indicate whether there's a menu or not in a given instance of the media modal. And in some cases, like with the edit details modal, there is a menu, but it's hidden with css.

We could just use the .image-details class to hide it on that particular modal, but I don't see an existing class that would work for featured images and this generally seems like a bad approach. Maybe we should add a .has-menu or .no-menu class?

[wonderboymusic]

In 29613:

Media Modal:

• the Image Details frame does not have a menu, indicate that by setting menu: false when adding states.
• mimic the default router rendering by toggling a hide-menu class on the frame when the region for menu is null
• remove the dead render code for the Image Details frame

See #29339.

[azaozz]

29339.patch fixes that from CSS for now. This needs another iteration in 4.1 :)

[helen]

In 29632:

Media modals: Better responsive views, especially the header.

• Only show the "dropdown" when there is a menu. Note that this uses a :not() selector, but it is supported in browsers that support media queries so it is safe to use here.
• Make the header shorter when on particularly narrow screens, which also tend to be shorter.
• Don't restrict the height of images in the attachment details modal, to take advantage of all available space.

fixes #29339.