As time passes with new each new release of the software, older base display templates (e.g. "Standard1", "Standard2", etc.) may be removed from newer installation. Therefore, any custom display templates referencing the older base display templates may no longer work. You will receive an error message if you try to use them.
The Storefront comes with a basic online code merge editor to help compare line differences. You may want to employ a 3rd party merge editor like WinMerge if you're more comfortable merging from a desktop application instead of performing the merge online.
There are several ways you can upgrade your display template (merge changes into a new template or merge changes to an existing template). We recommend to merge changes to a new display template as it is the safest approach and allows you to incrementally test your new template before overwriting your old display template.
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