Exporting an Space to HTML doesn't includes attachments from gallery macros included from other spaces

Steps to reproduce the problem:

1) Create a space named SpaceA
2) Create a page within SpaceA called PageA
3) Attach an image to PageA named ImageA.png
4) On PageA, add a gallery macro containing ImageA.png
5) Export PageA and verify that the full page along with the image were exported with the image available by clicking on the thumbnail
6) Create a space named SpaceB
7) Create a page within SpaceB called PageB
8) On PageB, add a gallery macro for ImageA.png using the syntax:

9) Export PageB and notice that the image has not been exported. When the export has been opened in a webbrowser, the thumbnail for ImageA is visible, but cannot be clicked to view the full size.

So, in a nutshell, if you are using a gallery macro that includes an image attachment from other space, I think the correct is to export this image together when exporting the original space where the gallery macro resides.