Missing integration of anchor and image2

[Olek Nowodziński]

Following #11341, it's not possible to create an anchor (with Anchor button) out of image2 widget (image) or, at least, the feature is buggy in most cases. Since it's possible to create linked images, users would expect to do the same with anchors.

There are two solutions: We can either completely disable the feature but, quite frankly, it would not make much sense since linking already works or we can simply enable it.

Special case of #11963.

[Piotrek Koszuliński]

Well, to be consistent, we should enable it. But let's wait for feedback first. Currently, in worst case, anchor cannot be edited after it's created on non-captioned image, or cannot be created at all. But there's no data loss.