Added testing coverage for the SlideBar widget

#392 in iced-rs/iced_aw — merged 2025-12-31

Added testing coverage for the SlideBar widget

Summary of Key Changes

Modified src/widget/slide_bar.rs:

• Implemented operate() method to register widget bounds for testing support
• Added unit tests

Added tests/slide_bar_integration_tests.rs

cargo test --lib slide_bar && cargo test --test slide_bar_integration_tests