Split ChildrenChanged/TextChanged events into distinct Inserted/Deleted events #655

Job	Run time
rustfmt	8s
find-msrv	3s
wasm-compatible-common-crate	32s
no-unused-dependencies	5s
nightly Clippy	50s
msrv-compliance	1m 7s
coverage	1m 40s
rustdoc	36s
benchmarks	1m 16s
semver-compliance	1m 7s
tests	1m 4s
	8m 28s

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