#449 Image has no line number with an `:alt:` attribute

[Adam Turner]

Reproducer:

>>> print(core.publish_doctree(".. image:: placeholder_image.jpg")[0].line)
1
>>> print(core.publish_doctree(".. image:: placeholder_image.jpg\n   :alt: blah")[0].line)
None

This is rather odd! Originally found whilst debugging a Sphinx issue.

A

[Günter Milde]

Reproducer:

```pycon

print(core.publish_doctree(".. image:: placeholder_image.jpg")[0].line)
1
print(core.publish_doctree(".. image:: placeholder_image.jpg\n :alt: blah")[0].line)
None
```

This is rather odd! Originally found whilst debugging a Sphinx issue.

This actually happens for all "image" and "figure" directives with
attributes::

Test the best

.. image:: placeholder_image.jpg

.. image:: placeholder_image.jpg
   :name: testimage

.. image:: placeholder_image.jpg
   :alt: blah

.. image:: placeholder_image.jpg
   :class: spam

.. image:: placeholder_image.jpg
   :width: 30%

.. figure:: placeholder_image.jpg

.. figure:: placeholder_image.jpg
   :align: right

conversion with rst2pseudoxml --expose-internal-attribute=line also
reveals that the line info in <image> and <figure> elements without
attributes is off by one.

[Adam Turner]

I'm looking into line numbering anyway, so hopefully I might be able to fix both issues at once.

A

[Günter Milde]

One more instance of [#41].