I wonder how to create new layout where some of it's regions like header and footer are able to inherit from the default layout.
Every time when I create a new layout I have a full set of regions and blocks to manage which is great. However, some regions like HEADER and FOOTER are pretty the same across all layouts. The inconvenience is that after creating several different layouts, if I start making changes to the header region of the default layout, e.g adding a search box to the header region, then I have to make the same update to the rest of the layouts . Even if I were to add a css class to the footer block for instance, I will still have to go through all the layouts again and add that class to the rest. So, I'm trying to find a way to reduce the redundancy across the layouts for some regions that are always consistent and remain the same. Any thoughts ?