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Fix full-wide on mobile regression. #18469
The PR refactored horizontal margins, including for full-wide blocks. As a result, full-wide blocks would, on the mboile breakpoint, receive too much negative margin.
This PR addresses that.
To test, insert any full wide block, though it's easier to see with the table block as it gets more visibly cropped. Test in TwentyTwenty and with vanilla styles. Test both on mobile (<600px) breaktpoint, and above. There should be no cropping, and no horizontal scrollbars.
However please note that there is an issue with TwentyNineteen editor styles as a result of the PR, and those need to be fixed separately as they need new styles. That is trac'ed here: https://core.trac.wordpress.org/ticket/48526