Rowling: galleries in block editor do not left-align flush with theme's CSS

[jessestu]

Steps to replicate

1. User the block editor on a site with Rowling theme.
2. Create an image gallery.
3. Publish the page.

Result

.post-content ul { margin-left: 1.5em; } causes the entire gallery to indent. This CSS seems to be in the theme.

Image:

Expected

I expected the gallery to align with the left with 0 margin. This CSS override fixes the issue:

.post-content ul.wp-block-gallery {
  margin-left: 0;
}

• User report: 1659287-zen
• Follow-up ticket: 1659287-zen (no followup needed as they have the CSS workaround)
• User's site: https://forcinduct.in/2018/12/20/lambo-aventador-svj/

[alaczek]

Fixed in r53230-wpcom-themes