[DataGrid] Fix column separators #12808
Merged
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Closes #12788
Closes #12783
Fix column separators, make the separators from their full width. The last column is
overflow: hidden
because otherwise the flex layout is messed up due to the separator sticking out of the row width.Preview: https://deploy-preview-12808--material-ui-x.netlify.app/x/react-data-grid/column-dimensions/