HTML: No more auto-wrapping of overlong source code lines in printed media

[HeikoTheissen]

Explain the problem.
Between releases 3.1.6 and 3.1.7, the generated CSS style for pre > code.sourceCode > span lost a display: inline-block rule, see this diff.

The print-specific rule

pandoc/test/lhs-test.html

Lines 180 to 183 in 104b3ba

	@media print {
	pre > code.sourceCode { white-space: pre-wrap; }
	pre > code.sourceCode > span { text-indent: -5em; padding-left: 5em; }
	}

is retained in 3.1.7, which is meant to produce hanging indentation of wrapped source code lines in printed media. However, without the display: inline-block, this has the effect of indenting the entire source code by 5em, rather than just the second and further lines.

Reproducible with the following markdown source file:

Look at my code:
```tex
This source code line is short.
This hopelessly overlong source code line will be automatically wrapped by pandoc.
```

When this is converted to HTML with the pandoc (3.1.7 or higher) command

pandoc -t html -o hanging.html -s hanging.md

and viewed with media type print emulated, it looks like

Look at my code:

        This source code line is short.
        This hopelessly overlong source code line will be automatically
wrapped by pandoc.

Note the unwanted indentation of both source code lines.

With pandoc 3.1.6 (where the CSS rule

pre > code.sourceCode > span { display: inline-block };

was still present), it looked better:

Look at my code:

This source code line is short.
This hopelessly overlong source code line will be automatically wrapped by
        pandoc.

The source code lines are not indented, but the second line is wrapped with hanging indentation.

The CSS rule

pre > code.sourceCode > span { display: inline-block };

should be retained at least for @media print.

Pandoc version?
Reproduced with

pandoc 3.1.11.1 on Windows 11
Features: +server +lua
Scripting engine: Lua 5.4

But the missing CSS rule

pre > code.sourceCode > span { display: inline-block };

affects all versions from 3.1.7 onwards.

[jgm]

Here's the background on the change: #7248
(Btw the actual commit was in jgm/skylighting, where this CSS is defined.)

Re-adding

pre > code.sourceCode > span { display: inline-block };

for @print should be harmless and should fix this.