Description of the need
Flexible templates have predetermined set of row styles provided by the function layout_flexible_row_styles(). There is a respectable selection there but if a user wanted a row with more that four columns, this is not provided; neither is there any way to provide alternate column widths.
We need a hook to allow modules to offer additional styles.
Proposed solution
A new hook_layout_flexible_row_styles() and hook_layout_flexible_row_styles_alter()
Alternatives that have been considered
None
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