@radial-gradient does not error when used on a property <color>

[bryce-happel-walton]

Language: Rust
Platform: Arm64

While messing around with brushes I noticed I wasn't getting the expected results from a gradient. Eventually I figured out that I was passing the macro to a property <color> and passing the property <color> to a property <brush>.

Using gradient macros on property <color> should at least produce a warning. It will truncate the result to the first color provided to the macro, I do not believe this to be an intuitive outcome.

[ogoffart]

Indeed, it would be worth displaying a warning when the user literally use @...-gradiant macro that is immediately converted to a colour.

The condition can be detected there

slint/internal/compiler/expression_tree.rs

Line 1102 in 74e2388

let from = match (ty, &target_type) {