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Extra vertical spacing is reported in Varia themes, that use this block a lot:
Automattic/themes#1798
This is because in the editor, every single block, including block containers, has an intrinsic top and bottom margin.
This unsets that margin for the layout grid, making sure editor and frontend look the same:
It has a side-effect — this doesn't look great:
However, it's still accurate! So in that vein I'm tempted to keep that as is. We can make rules to space this out, but I lean towards not doing that. If you really want to insert multiple layout grids after each other, it feels correct to show that they will snug up against each other.
Finally, it fixes an issue where on some themes, the end-gutter option wouldn't work. Pictured below, end gutters not working:
It works in this PR, rest assured.
I would not call a release of this urgent — fine to bundle it up with other patches that may need to be made.