Fix code-block linenumbers highlight on Safari #1489
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Issue
When using Safari and highlighting text in a code block with line numbers, the line numbers are also included. Line numbers are not included with eg. Firefox.
How to reproduce
Open https://sphinx-rtd-theme.readthedocs.io/en/stable/demo/demo.html#emphasized-lines-with-line-numbers with Safari (I used v16.5.2) and highlight the code block.
Expected behavior
Line numbers should not be included when highlighting.
What is done
-webkit-user-select: none
field. This is needed on Safari to disable highlighting. See https://developer.mozilla.org/en-US/docs/Web/CSS/user-select for details.