Resolve #3189592 "Pre region limits validation"
requested to merge issue/layout_builder_limit-3189592:3189592-pre-region-limits-validation into 1.0.x
Refactored the limit form field validation. Changed some message logic to allow min and max to be the same value for instance. Fixed an issue that popped up where the delta value was invalid on a fresh default layout when trying to add a custom block.