Set color for <a> in a more straightforward way.

[jsha]

Previously, we set the default color for tags to black, and then had an override with a bunch of not() clauses to set anchors in
docblocks to blue.

Instead, we should set the default color for to blue (or equivalent in other themes), and override it for places like the sidebar or search results, where we don't want them to be styled as links.

Demo at https://rustdoc.crud.net/jsha/theme-anchor/std/string/struct.String.html. This should result in no visible changes.

r? @GuillaumeGomez

[rust-highfive]

Some changes occurred in HTML/CSS/JS.

cc @GuillaumeGomez

[GuillaumeGomez]

It changes a few things:

Can you also provide a doc with usage of the "jump to def" feature? I think it'll change their color as well.

And finally: please add GUI tests for the two cases above and for links more generally. ;)

[jsha]

Here's a doc with the jump to def feature: https://rustdoc.crud.net/jsha/theme-anchor-rustls/src/rustls/cipher.rs.html#8-12. You were right, the links in the source view had the wrong color. I fixed that.

I also made a small tweak to the rustdoc-gui tester, so it would print full filenames on error. That's something I've run into trouble with before; it's not always clear what needs fixing, particularly when I was new on the project.

[GuillaumeGomez]

Better enforce the theme used (I had some issues because my default theme isn't the light one). To do it, take a look here.

[GuillaumeGomez]

I also made a small tweak to the rustdoc-gui tester, so it would print full filenames on error. That's something I've run into trouble with before; it's not always clear what needs fixing, particularly when I was new on the project.

Then it's a good idea, thanks!

[GuillaumeGomez]

Thanks! r=me once CI pass.

[jsha]

@bors r=GuillaumeGomez rollup

[bors]

📌 Commit a56559d has been approved by GuillaumeGomez