Remove image in FileManager in use by RealBlog

[BillyV2018]

The FileManager will correctly detect when an image is in use on one of the pages.
But it will remove an image used in one of the blog Articles, and that is a pity.

[olape-git]

The file browser can only check the files that are directly integrated in the content.
Realblog, Boilerplate, ... manage their content themselves, separately from XH.
An API would have to be created in the file browser for this, and the plugins would also all have to be revised.
I see little chance of this happening.