Breaking: #480 - Refactored PageTitleViewhelper

See Issue 480

Description

The existing TitleTagViewHelper was removed because it stopped working after TYPO3 v10. The new ViewHelper adds the same functionality but its usage is different.

Affected Installations

The ViewHelper was not used in EXT:cart itself. But other extensions as e.g. EXT:cart_products used it. Overwrites and own implementations of templates which used <cart:titleTag> need adaption.

Migration

Migrate the old usage of the ViewHelper as shown below

e.g. overwrite of EXT:cart_products/Resources/Private/Templates/Product/Show.html 
<!-- OLD IMPLEMENTATION -->
<cart:format.nothing>
    <cart:titleTag>
        <f:format.htmlentitiesDecode>{product.title}</f:format.htmlentitiesDecode>
    </cart:titleTag>
</cart:format.nothing>

<!-- NEW IMPLEMENTATION -->
<cart:titleTag pageTitle="{product.title}" />
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