Fix codeblock dynamic line length calculation for indented examples #33390

Job	Run time
cargo fmt	20s
Determine changes	12s
mkdocs	2m 59s
pre-commit	40s
python package	1m 19s
benchmarks	5m 1s
cargo build (release)	5m 20s
cargo clippy	2m 1s
cargo build (msrv)	3m 34s
cargo fuzz	5m 21s
cargo shear	27s
cargo test (linux)	3m 53s
cargo test (wasm)	1m 38s
cargo test (windows)	8m 37s
formatter instabilities and black similarity	3m 58s
test scripts	58s
test ruff-lsp	18s
ecosystem	5m 33s
Fuzz the parser	0s
	52m 9s

Provide feedback