Image block captions are not synced with media library

[jeremyfelt]

Describe the bug

Images in the media library have caption data that can be entered. When images are inserted into content, the caption follows the image.

In the classic editor, when the caption is edited in post content, it also changes in the media library.

In Gutenberg, when the caption is edited in post content, it does not change in the media library.

In both the classic editor and Gutenberg, when the caption is edited by editing the image itself, the updated caption is applied to the content.

To Reproduce
Steps to reproduce the behavior:

1. Open a new post
2. Add an image block
3. Select a media item
4. Edit the media item's caption in attachment details
5. Click "Select" to insert the media
6. Edit the caption directly in the block
7. Edit the image
8. Look at the caption in attachment details

Expected behavior

Based on current behavior, I would expect that the caption text is synchronized between the image in content and the media library.

Additional context

• Gutenberg 3.0.1
• WordPress 4.9.6

[danielbachhuber]

In the classic editor, when the caption is edited in post content, it also changes in the media library.

Are you sure about this? I don't believe it's the case. As soon as an image is inserted into the post, its caption and alt text are properties of the post, no longer the attachment database object.

Can you share a GIF or some screenshots of the behavior?

[jeremyfelt]

Bah, I was fooled. :)

When editing an image via post content in the classic editor, an "Image Details" modal comes up that shows the caption from post content. It does not sync with the media item's caption.

When editing an image via post content in Gutenberg, the "Select or Upload Media" modal comes up. This allows you to override the caption currently in post content, but does not sync from post content.

So more of a behavior change than a bug it seems like.

Classic editor:

Gutenberg:

[danielbachhuber]

@jeremyfelt No bug then?

[jeremyfelt]

Yeah, just some initial confusion for somebody used to a workflow. It's documented now though. :)

Thanks!