Tagging Parsoid as we think this issue might get resolved by the work @Arlolra is doing to improve support for galleries.

The old alt text should immediately change.

To clarify, what you mean is that, as you type in the "Caption" box, the "Alternative text" field should update itself to match.

At present, while the "Use the caption as the alternative text" is checked, the "Alternative text" is greyed out and uneditable and the field is ignored. In other words, it's working as intended but there isn't enough visual feedback.

Yes—the wrong visual feedback makes me think it doesn't work as intended :)

Change 896168 had a related patch set uploaded (by Arlolra; author: Arlolra):

[mediawiki/extensions/VisualEditor@master] [WIP] Update gallery alt with caption when set as same

https://gerrit.wikimedia.org/r/896168

In T330842#8680946, @Amire80 wrote:

Yes—the wrong visual feedback makes me think it doesn't work as intended :)

Wrong is pretty subjective

@ppelberg I believe the above patch satisfies the request. Please decide if it's something your team wants. Thanks

Change 896168 merged by jenkins-bot:

[mediawiki/extensions/VisualEditor@master] Update gallery alt with caption when set as same

https://gerrit.wikimedia.org/r/896168

✅ alt text is updated to match caption when Use the caption as the alternative text is checked

✅ behaves as expected when `Use the caption as the alternative text isn't checked