Improve IME area reporting and set IME area in `TextArea` (#785) #2415

Job	Run time
cargo check (aarch64-android)	35s
cargo check (msrv) (wasm32)	23s
cargo clippy (windows-latest)	5m 0s
cargo check (msrv) (windows-latest)	2m 36s
cargo clippy (macos-latest)	2m 45s
cargo check (msrv) (macos-latest)	49s
cargo clippy (ubuntu-latest)	3m 36s
cargo clippy (wasm32)	2m 9s
cargo doc	53s
cargo check (msrv) (ubuntu-latest)	51s
formatting	29s
Prime LFS Cache	7s
cargo test (wasm32)	28s
typos	41s
cargo test (windows-latest)	4m 10s
cargo test (macos-latest)	2m 34s
cargo test (ubuntu-latest)	4m 8s
	32m 14s

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