Fix replacement edit range computation #30170

Job	Run time
pre-commit	43s
Determine changes	9s
mkdocs	2m 19s
cargo fmt	17s
python package	1m 13s
cargo clippy	1m 46s
cargo build (msrv)	2m 57s
cargo build (release)	4m 15s
benchmarks	3m 55s
cargo fuzz	4m 17s
cargo shear	20s
cargo test (linux)	3m 32s
cargo test (wasm)	1m 8s
cargo test (windows)	6m 38s
formatter instabilities and black similarity	0s
test scripts	59s
test ruff-lsp	16s
ecosystem	8m 44s
Fuzz the parser	0s
	43m 28s

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