Hyphenated variant breaks code block render hook selection

[jmooring]

This is a regression from 0.145.0 to 0.146.0.

layouts/
├── _markup/
│   ├── render-codeblock.html
│   ├── render-codeblock-go.html                <-- uses render-codeblock-go-html-template.html
│   ├── render-codeblock-go-html-template.html  <-- uses render-codeblock.html 
│   ├── render-codeblock-xy.html
│   └── render-codeblock-x-y.html               <-- uses render-codeblock.html  
└── home.html

func TestIssue13864(t *testing.T) {
	t.Parallel()

	files := `
-- hugo.toml --
disableKinds = ['page','rss','section','sitemap','taxonomy','term']
-- content/_index.md --
---
title: home
---

~~~
LANG: none
~~~

~~~go
LANG: go
~~~

~~~go-html-template
LANG: go-html-template
~~~

~~~xy
LANG: xy
~~~

~~~x-y
LANG: x-y
~~~
-- layouts/home.html --
{{ .Content }}
-- layouts/_markup/render-codeblock.html --
{{ .Inner }} LAYOUT: render-codeblock.html|
-- layouts/_markup/render-codeblock-go.html --
{{ .Inner }} LAYOUT: render-codeblock-go.html|
-- layouts/_markup/render-codeblock-go-html-template.html --
{{ .Inner }} LAYOUT: render-codeblock-go-html-template.html|
-- layouts/_markup/render-codeblock-xy.html --
{{ .Inner }} LAYOUT: render-codeblock-xy.html|
-- layouts/_markup/render-codeblock-x-y.html.html --
{{ .Inner }} LAYOUT: render-codeblock-x-y.html|
`

	b := hugolib.Test(t, files)

	b.AssertFileContent("public/index.html",
		"LANG: none LAYOUT: render-codeblock.html|",                              // pass
		"LANG: go LAYOUT: render-codeblock-go.html|",                             // fail: uses render-codeblock-go-html-template.html
		"LANG: go-html-template LAYOUT: render-codeblock-go-html-template.html|", // fail: uses render-codeblock.html
		"LANG: xy LAYOUT: render-codeblock-xy.html|",                             // pass
		"LANG: x-y LAYOUT: render-codeblock-x-y.html|",                           // fail: uses render-codeblock.html
	)
}

Reference: https://discourse.gohugo.io/t/custom-render-codeblock-go-template-html-not-called/55394

[irkode]

just recognized and maybe related:

I sometimes turn off a render-hook by renaming it

• OFFrender-codeblock.html <-- This one is triggered UNEXPECTED

• OFF-render-codeblock.html <-- This one is not used OK