Are the gallery css output on front margins needed

[karmatosed]

This is an issue purely with the front, rendered through a theme, not through the editor. Currently the gallery outputs a right margin on the front.:

.wp-block-gallery:not(.components-placeholder) { margin-right: -16px; }

These work ok on fixed themes - with a single body width. However, I am working on for the Gutenberg Theme a fluid width, allowing for things like full width images/content to be up to the editor. This comes into more play as we move to have layout.

For example, this doesn't work because of that margin:

.wp-block-gallery{ margin: 1.5em auto; max-width: 1100px; }

If you use a scary !important, it can be got around. I would suggest though that looking into if having a negative margin on the block is needed though. Happy if another work around also works. I mostly want to know why this is needed and can we avoid it?