portal-logo class missing on <img>-only header logo #1185

Problem

When a Picture uses the TACC template override logic that hoists instance.attributes_str to <a> or to <figure>, child templates cannot reliably add a separate class on <img> for the img-only case.

State

Header logo¹ needs portal-logo on <img>. Though Core-Styles supports logo having link and not having link (i.e. <img>-only markup), Core-CMS fails to add class="portal-logo" to <img> when logo has no link (or no caption).

Linked header logos (default: home page link) are unaffected.

Cause

taccsite_cms/templates/djangocms_picture/default/picture.html hoists plugin attributes to the parent when link, caption, default caption, or child plugins exist. Otherwise attributes render on <img>. A second class="portal-logo" via picture_attributes_img duplicates class on <img> when attributes are not hoisted; browsers keep one value, so portal-logo is lost.

Reproduction

1. Header logo plugin with portal_logo picture template.
2. Remove link (and caption).
3. Expect <img class="… portal-logo"> (or equivalent).
4. Observe missing (or incorrect) portal-logo on <img>.

Context

• occurs since:
  • Let CMS Admin Edit Header #999
  • feat: GH-999 let CMS admin change header logo #1083
• discussion