Route debug() calls in Slint consistently through Platform's debug_log() (#5718)

api/cpp/include/slint.h

@@ -124,6 +124,11 @@ upgrade_item_weak(const cbindgen_private::ItemWeak &item_weak)
     }
 }
 
+inline void debug(const SharedString &str)
+{
+    cbindgen_private::slint_debug(&str);
+}
+
 } // namespace private_api
 
 template<typename T>

api/cpp/lib.rs

@@ -152,6 +152,11 @@ pub extern "C" fn slint_string_to_float(string: &SharedString, value: &mut f32)
     }
 }
 
+#[no_mangle]
+pub extern "C" fn slint_debug(string: &SharedString) {
+    i_slint_core::debug_log!("{string}");
+}
+
 #[cfg(not(feature = "std"))]
 mod allocator {
     use core::alloc::Layout;