Fix C++ build

With ImageInner::StaticTextures (the variant) and StaticTextures (the
struct), we need to disambiguate for the generated enum contructor
functions. This is done by prefixing the enum variant with their name.

api/cpp/cbindgen.rs

@@ -227,6 +227,7 @@ fn gen_corelib(
                 "slint_image_path",
                 "SharedPixelBuffer",
                 "SharedImageBuffer",
+                "StaticTextures",
             ],
             vec!["Color"],
             "slint_image_internal.h",

api/cpp/include/slint_image.h

@@ -15,13 +15,13 @@ namespace slint {
 struct Image
 {
 public:
-    Image() : data(Data::None()) { }
+    Image() : data(Data::ImageInner_None()) { }
 
     /// Load an image from an image file
     static Image load_from_path(const SharedString &file_path)
     {
         Image img;
-        img.data = Data::AbsoluteFilePath(file_path);
+        img.data = Data::ImageInner_AbsoluteFilePath(file_path);
         return img;
     }
 

internal/compiler/generator/cpp.rs

@@ -1944,7 +1944,7 @@ fn compile_expression(expr: &llr::Expression, ctx: &EvaluationContext) -> String
                 crate::expression_tree::ImageReference::EmbeddedData { resource_id, extension } => {
                     let symbol = format!("slint_embedded_resource_{}", resource_id);
                     format!(
-                        r#"slint::Image(slint::cbindgen_private::types::ImageInner::EmbeddedData(slint::cbindgen_private::Slice<uint8_t>{{std::data({}), std::size({})}}, slint::cbindgen_private::Slice<uint8_t>{{const_cast<uint8_t *>(reinterpret_cast<const uint8_t *>(u8"{}")), {}}}))"#,
+                        r#"slint::Image(slint::cbindgen_private::types::ImageInner::ImageInner_EmbeddedData(slint::cbindgen_private::Slice<uint8_t>{{std::data({}), std::size({})}}, slint::cbindgen_private::Slice<uint8_t>{{const_cast<uint8_t *>(reinterpret_cast<const uint8_t *>(u8"{}")), {}}}))"#,
                         symbol, symbol, escape_string(extension), extension.as_bytes().len()
                     )
                 }

internal/core/graphics/image.rs

@@ -236,6 +236,7 @@ pub struct StaticTextures {
 /// A resource is a reference to binary data, for example images. They can be accessible on the file
 /// system or embedded in the resulting binary. Or they might be URLs to a web server and a downloaded
 /// is necessary before they can be used.
+/// cbindgen:prefix-with-name
 #[derive(Clone, PartialEq, Debug)]
 #[repr(u8)]
 #[allow(missing_docs)]