Ability to overwrite the mini cart icon

[thirumani02]

Sometimes, themes may need to add their own cart icon to keep the consistency with their other icons. I believe filtering the icon would help to overwrite the icon.

Changelog

Line 379 & Line 383 - Wrapping the icon with apply_filters.

[Aljullu]

Thanks for opening this PR, @thirumani02! Really appreciated for your effort to improve the Mini Cart block.

We agree this is a valid use case and we would like to offer the possibility to customize that icon. However, I'm not sure a PHP filter is the best option here.

Let me explain the reasons:

• We are planning to allow changing the icon from the editor at some point (see Mini Cart > alternative icons #6868). This will allow users to directly change the icon from the UI, without needing to dig into the code. Introducing a PHP filter that overrides that option might be confusing for users.
• We acknowledge that some themes might want to set a custom icon to provide a more curated look and feel. In those cases, however, we would like to experiment if there is a better API we can offer than a PHP filter. One idea would be to add an attribute in theme.json to allow themes to define a custom Mini Cart icon.

Let us know if you would like to explore #6868 or the theme.json approach and we will be happy to help. In the meanwhile, however, I will close this PR.