headerlinks don't show for autodoc entries

[goodmami]

The link pilcrow on headers shows when the cursor hovers on the header, but it does not show for things like Python function generated by autodoc. For instance, see https://bashtage.github.io/sphinx-material/pymethod.html#send_message, there is a pilcrow after the parameter list of the send_message function, but its opacity is 0 and it is not adjusted when the cursor hovers.

I think this is just due to a missing or overly-constrained CSS rule.

[bashtage]

Agree with this. Should behave like the one below.

[bashtage]

This is why it shows up in a heading:

.md-typeset h2[id] .headerlink:focus, .md-typeset h2[id]:hover .headerlink, .md-typeset h2[id]:target .headerlink