Copy button not shown on some pages

[nijel]

Describe the bug

context
When I go to https://docs.weblate.org/en/latest/api.html, the copy button is not present, while it works fine on other pages.

expectation
I expected copy button to occur.

bug
But instead nothing happens. There are no error messages in the browser. The code is within div.highlight pre selector, so the copy button should be present.

problem

Looking at the code, it seems that window.ClipboardJS is not initialized for some reason and that blocks adding copy buttons:

sphinx-copybutton/sphinx_copybutton/_static/copybutton.js_t

Line 129 in fae1f06

if (window.ClipboardJS === undefined) {

I have no clue why it fails to load, but maybe it's time to drop this code and use
navigator.clipboard.writeText directly as described in #97?

Reproduce the bug

I currently have no clue how to reproduce this outside our documentation. The source code is here: https://github.com/WeblateOrg/weblate/tree/main/docs

List your environment

furo==2023.03.27
pygments==2.15.0
Sphinx==6.1.3
sphinx-copybutton==0.5.1
sphinx-jsonschema==1.19.1
sphinxcontrib-httpdomain==1.8.1
sphinxext-opengraph==0.8.1

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[stefanodavid]

@nijel out of curiosity (and thanks to 15 minutes free!) I made a build of Weblate's docs and, to my surprise, if you change the theme from furo to sphinx_rtd_theme, the copybuttons are shown. So in the end it might not be a bug in this extension, but some strange interaction with furo?

[nijel]

You're right, it works with some other theme. It also works with the Furo theme if I move the inclusion of the clipboard.min.js script somewhere in the middle of the document. I have no clue why it silently fails to initialize when it is at the bottom.

Instead of debugging obsolete code of clipboard.js, I decided to avoid it in #206