Intersphinx inventory fragment IDs get over-normalized.

[ebolyen]

Description

It appears that xref:sphinx style link nodes have their url attribute normalized, whereas the original urlSource preserves case.
Here is an example:

<xref:qiime2#qiime2.plugin.Bool>

This correctly matches the intersphinx inventory and myst resolves it, but produces the following AST:

{
    "type": "link",
    "url": "https://develop.qiime2.org/en/latest/plugins/references/api/types.html#qiime2.plugin.bool",
    "position": {
        "start": {
            "line": 5,
            "column": 1
        },
        "end": {
            "line": 5,
            "column": 1
        }
    },
    "children": [
        {
            "type": "text",
            "value": "qiime2",
            "key": "WmC8YrGWys"
        }
    ],
    "urlSource": "xref:qiime2#qiime2.plugin.Bool",
    "internal": false,
    "protocol": "xref:sphinx",
    "key": "PAt4Q0ZuxY"
}

This normalized url does not function as the fragment has changed from Bool to bool.
In the browsers I've checked (Firefox and Chrome), URL fragments are case-sensitive.

Proposed solution

Don't normalize the fragment id under the xref:sphinx protocol.

Additional notes

§ jupyter-book --version
v2.0.0-a0

myst.yml references section

  references:
    qiime2: https://develop.qiime2.org/en/latest/

[ebolyen]

Oh and the children property makes it look like this normalization must have happened relatively early, since I would expect something other than the project label to make it into link's text.

[ebolyen]

Looks like it may be this line in the intersphinx package:
https://github.com/continuous-foundation/intersphinx/blob/main/src/intersphinx.ts#L157

It's been that way for a few years, @rowanc1, do you recall the reason for this?

§ intersphinx list https://develop.qiime2.org/en/latest/ --domain py:data --includes Bool
py:data  (qiime2.plugin.Bool)
  https://develop.qiime2.org/en/latest/plugins/references/api/types.html#qiime2.plugin.bool

vs

§ python -m sphinx.ext.intersphinx Downloads/objects.inv | grep -C1 Bool
py:data
    qiime2.plugin.Bool                                                               : plugins/references/api/types.html#qiime2.plugin.Bool
    qiime2.plugin.Categorical                                                        : plugins/references/api/types.html#qiime2.plugin.Categorical

[ebolyen]

I maybe have a fix here: continuous-foundation/intersphinx#5

[rowanc1]

Thanks @ebolyen - I will take a look monday and get this in!