Images-Links broken after import from wordpress.xml in WordPress 4.1.1

[WulfP]

In XML:
<wp:meta_value><..."Fotolia_65968659_S-300x205.jpg"...></wp:meta_value>

After Import the Image-File is created as

Fotolia_65968659_S-300x206.jpg

but the img-src still is ...300x205.jpg.

The same happend to Fotolia_66268596_S-300x199.jpg. The Filename was changed to ...300x200.jpg, the link did´n change.

Seems to be a rounding-issue when recalculating Image-Sizes.

[kraftner]

I can confirm this issue. The problem was introduced in [30660] as a result of #18532 changing the rounding behaviour when scaling images.

Generally this doesn't cause any issues on existing sites because existing files and <img> aren't touched.

But when you are regenerating thumbs or importing attachments from a WXR file they get generated differently in the filesystem leaving all <img> in post_content dead.

I also have a question on WPSE looking for a solution or workaround: ​http://wordpress.stackexchange.com/q/202622/47733

I am not sure yet if this should be handled in core or the importer (or any other plugins that have an issue with this like image regeneration plugins)

[kraftner]

I have mentioned this workaround in the WPSE question linked above, but adding it here anyway:

[30660] introduced a new filter wp_constrain_dimensions which can be used to just plug the old behaviour from before 4.1 back in, but this isn't really a solution, just a revert to old behaviour.