Convert standalone_icons to a map

src/search.rs

@@ -260,8 +260,16 @@ impl IconLocations {
     pub fn icons(self) -> Icons {
         let themes = self.resolve();
         
+        let standalone_icons = self.standalone_icons
+            .into_iter()
+            .map(|file| {
+                let key = file.path.file_stem().map(|s| s.to_string_lossy().to_string()).unwrap_or(String::new());
+                (key, file)
+            })
+            .collect();
+
         Icons {
-            standalone_icons: self.standalone_icons,
+            standalone_icons,
             themes,
         }
     }

src/theme.rs

@@ -20,7 +20,7 @@ use std::sync::Arc;
 /// Icons::new().find_icon("firefox", 32, 1, "hicolor");
 /// ```
 pub struct Icons {
-    pub standalone_icons: Vec<IconFile>,
+    pub standalone_icons: HashMap<String, IconFile>,
     pub themes: HashMap<OsString, Arc<Theme>>,
 }
 
@@ -82,9 +82,7 @@ impl Icons {
     /// 
     /// These icons do not have any size or scalability information attached to them. 
     pub fn find_standalone_icon(&self, icon_name: &str) -> Option<IconFile> {
-        self.standalone_icons
+        self.standalone_icons.get(icon_name)
-            .iter()
-            .find(|ico| ico.path.file_stem() == Some(icon_name.as_ref()))
             .cloned()
     }
 }