XWIKI-24157 has partially fixed this for static macros that don't produce any output. This:
one {{html}}{{/html}} three
shows the macro placeholder, unlike this:
one {{html}}<span class="test"></span>{{/html}} three
which doesn't show the macro placeholder, so the user has no idea there is a macro there. We need to check not only the presence of a macro output but also whether the macro output is actually visible. And we need to think about macros that load their output lazily.
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