fix: Off-by-one when text change longer than MAX_WORDS_PER_LINE #3201

Job	Run time
Rustfmt	1m 20s
Actionlint	1m 0s
Check Linux Packaging	4m 17s
Output Regression Test	4m 43s
Test Linux (latest stable Rust)	2m 15s
Test x86_64-unknown-linux-gnu	4m 14s
Test with MIME database	4m 2s
Test x86_64-apple-darwin	6m 17s
Test x86_64-pc-windows-msvc	5m 6s
Test aarch64-unknown-linux-gnu	5m 42s
Test aarch64-apple-darwin	3m 55s
Test x86_64-unknown-linux-musl	4m 35s
	47m 26s

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