animations example: `unknown type for floem::style::BorderRadius`

[Jasha10]

I got a panic when trying to cargo run the animations example.

To reproduce:

git clone https://github.com/lapce/floem
cd floem/examples/animations
RUST_BACKTRACE=1 cargo run

$ RUST_BACKTRACE=1 cargo run
    Finished dev [unoptimized + debuginfo] target(s) in 0.11s
     Running `/home/homestar/tmp/floem/target/debug/animations`
thread 'main' panicked at src/animate/prop.rs:148:17:
unknown type for floem::style::BorderRadius
stack backtrace:
   0: rust_begin_unwind
             at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/std/src/panicking.rs:645:5
   1: core::panicking::panic_fmt
             at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/core/src/panicking.rs:72:14
   2: floem::animate::prop::AnimatedProp::animate
             at /home/homestar/tmp/floem/src/animate/prop.rs:148:17
   3: floem::animate::animation::Animation::animate_prop
             at /home/homestar/tmp/floem/src/animate/animation.rs:339:13
   4: floem::view_data::ViewState::compute_style
             at /home/homestar/tmp/floem/src/view_data.rs:221:25
   5: floem::context::AppState::compute_style
             at /home/homestar/tmp/floem/src/context.rs:276:9
   6: floem::context::StyleCx::style_view
             at /home/homestar/tmp/floem/src/context.rs:1085:29
   7: floem::view::View::style::{{closure}}
             at /home/homestar/tmp/floem/src/view.rs:183:13
   8: <floem::views::stack::Stack as floem::view::View>::for_each_child_mut
             at /home/homestar/tmp/floem/src/views/stack.rs:105:16
   9: floem::view::View::style
             at /home/homestar/tmp/floem/src/view.rs:182:9
  10: <alloc::boxed::Box<dyn floem::view::View> as floem::view::View>::style
             at /home/homestar/tmp/floem/src/view.rs:680:9
  11: <alloc::boxed::Box<dyn floem::view::View> as floem::view::View>::style
             at /home/homestar/tmp/floem/src/view.rs:680:9
  12: floem::context::StyleCx::style_view
             at /home/homestar/tmp/floem/src/context.rs:1132:9
  13: floem::view::View::style::{{closure}}
             at /home/homestar/tmp/floem/src/view.rs:183:13
  14: <floem::views::container_box::ContainerBox as floem::view::View>::for_each_child_mut
             at /home/homestar/tmp/floem/src/views/container_box.rs:68:9
  15: floem::view::View::style
             at /home/homestar/tmp/floem/src/view.rs:182:9
  16: <alloc::boxed::Box<dyn floem::view::View> as floem::view::View>::style
             at /home/homestar/tmp/floem/src/view.rs:680:9
  17: floem::context::StyleCx::style_view
             at /home/homestar/tmp/floem/src/context.rs:1132:9
  18: floem::view::View::style::{{closure}}
             at /home/homestar/tmp/floem/src/view.rs:183:13
  19: <floem::views::stack::Stack as floem::view::View>::for_each_child_mut
             at /home/homestar/tmp/floem/src/views/stack.rs:105:16
  20: floem::view::View::style
             at /home/homestar/tmp/floem/src/view.rs:182:9
  21: <alloc::boxed::Box<dyn floem::view::View> as floem::view::View>::style
             at /home/homestar/tmp/floem/src/view.rs:680:9
  22: floem::context::StyleCx::style_view
             at /home/homestar/tmp/floem/src/context.rs:1132:9
  23: floem::view::View::style::{{closure}}
             at /home/homestar/tmp/floem/src/view.rs:183:13
  24: <floem::window_handle::WindowView as floem::view::View>::for_each_child_mut
             at /home/homestar/tmp/floem/src/window_handle.rs:1596:9
  25: floem::view::View::style
             at /home/homestar/tmp/floem/src/view.rs:182:9
  26: floem::context::StyleCx::style_view
             at /home/homestar/tmp/floem/src/context.rs:1132:9
  27: floem::window_handle::WindowHandle::style
             at /home/homestar/tmp/floem/src/window_handle.rs:503:9
  28: floem::window_handle::WindowHandle::process_update_no_paint
             at /home/homestar/tmp/floem/src/window_handle.rs:673:17
  29: floem::window_handle::WindowHandle::process_update
             at /home/homestar/tmp/floem/src/window_handle.rs:651:12
  30: floem::app_handle::ApplicationHandle::idle
             at /home/homestar/tmp/floem/src/app_handle.rs:330:13
  31: floem::app::Application::run
             at /home/homestar/tmp/floem/src/app.rs:132:9
  32: floem::app::launch
             at /home/homestar/tmp/floem/src/app.rs:29:5
  33: animations::main
             at ./src/main.rs:87:5
  34: core::ops::function::FnOnce::call_once
             at /rustc/82e1608dfa6e0b5569232559e3d385fea5a93112/library/core/src/ops/function.rs:250:5
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

[Resonanz]

Same problem on my Windows 11 box.