wgui: parser: normalize paths in <include>s, (fix rust-embed file not found in release build)

wgui/src/assets.rs

@@ -1,3 +1,22 @@
+use std::path::{Path, PathBuf};
+
 pub trait AssetProvider {
 	fn load_from_path(&mut self, path: &str) -> anyhow::Result<Vec<u8>>;
 }
+
+// replace "./foo/bar/../file.txt" with "./foo/file.txt"
+pub fn normalize_path(path: &Path) -> PathBuf {
+	let mut stack = Vec::new();
+	for component in path.components() {
+		match component {
+			std::path::Component::ParentDir => {
+				stack.pop();
+			}
+			std::path::Component::Normal(name) => {
+				stack.push(name);
+			}
+			_ => {}
+		}
+	}
+	stack.iter().collect()
+}