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Adding the alt attribute solves this problem. However, it seems that putting the filename in the alt attribute of the image is not recommended from an accessibility standpoint. https://developer.mozilla.org/en-US/docs/Web/HTML/Element/img#accessibility

If you have a better idea, please let me know.

I have attached a different approach as a patch.

This patch adds a tooltip (title attribute) to the thumbnail element (which contains both the image and the button). Additionally, this patch adds an alt attribute to the image, as the documentation states that the alt attribute is required for the img tag.

As a result of applying this patch:

What do you think?

Setting the target version to 6.0.3.

Yesterday, I set the target version of this patch to 6.0.3, but after reviewing the content again, I decided to change the target version to 6.1.0.

This patch modifies the DOM structure of the thumbnail display area, which could potentially affect custom themes and plugins. Therefore, I believe it is not suitable to include this in a maintenance release like 6.0.3.

I suggest committing quick-workaround.diff from #note-1, which avoids DOM changes, to version to the 6.0-stable branch for version 6.0.3, and Move-tooltip-from-image-to-thumbnail-element.patch from #note-2, which follows web standards but changes the DOM, to the trunk for version 6.1.0.

I have committed quick-workaround.diff in r23452. Thank you for your contribution.

Merged the fix into the 6.0-stable branch in r23459.

The another patch Move-tooltip-from-image-to-thumbnail-element.patch will be handled in #42133.