Incorrect src attribute for images in featured posts in bootblog4 theme

[txels]

Environment

Python Version: 3.8.5

Nikola Version: 8.1.1

Operating System: Ubuntu 20.10

Description:

It appears that Nikola 8.1.1 has introduced either a bug or a backwards-incompatible change that makes images in featured posts using the bootblog4 template render incorrecty.

My featured posts include these headings:

.. status: featured
.. previewimage: /galleries/face-a-day-2020/20200817-me.png

My nikola site is rendered under a path:

# conf.py
SITE_URL = "https://carles.barrobes.com/drawing/"
# BASE_URL not set

• With nikola 8.0.4, this would generate a correct src attribute galleries/face-a-day-2020/20200817-me.png
• In nikola 8.1.1, this generates a relative path that doesn't work drawing/galleries/face-a-day-2020/20200817-me.png as it generates an invalid image URL of https://carles.barrobes.com/drawing/drawing/galleries/face-a-day-2020/20200817-me.png (duplicated drawing in the path).

The source of the issue seems to have been introduced here: e559cfd

[Kwpolska]

The diff link doesn’t work, please link to the specific commit.

[txels]

Hmmm. Possibly this commit then e559cfd

[Kwpolska]

I created PR #3475 with a fix, please test.