Improve diffs inside Elixir sigils #3288

Job	Run time
Actionlint	1m 2s
Rustfmt	1m 31s
Test x86_64-unknown-linux-gnu	4m 12s
Check Linux Packaging	4m 4s
Test x86_64-apple-darwin	1s
Output Regression Test	4m 28s
Test Linux (latest stable Rust)	2m 19s
Test x86_64-pc-windows-msvc	5m 1s
Test aarch64-unknown-linux-gnu	5m 29s
Test with MIME database	3m 59s
Test aarch64-apple-darwin	3m 56s
Test x86_64-unknown-linux-musl	4m 19s
	40m 21s

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