We weren't using the TextLinkStyles provided by the LinkAnnotation API,
and as a result, our links weren't stateful. We were also not properly
setting a disabled colour — now we do.
Also changed, we force the Markdown text to not be focusable, even if it
is clickable, since we don't want it to get focused. Now only links are
focused while tabbing through Markdown.
This also removes some testing harness left around from #425, and that
we don't need anymore.
Note: links should have a border around them when they are focused, but
that's not possible with the Compose APIs. What we do instead is show
a subtle background color,
taken from the ActionButtons' hover and pressed states, for our focused
and pressed states, respectively.
GitOrigin-RevId: 8cd3eee5791dbdb5f4f96f4e569e1f28923d1619