move widgets on draw if region size is same

src/util/id.rs

@@ -1,9 +1,4 @@
-/// intentionally does not implement copy or clone
-/// which should make it harder to misuse;
-/// the idea is to generally try to guarantee all IDs
-/// point to something valid, although duplicate
-/// gets around this if needed
-#[derive(Eq, Hash, PartialEq, Debug)]
+#[derive(Eq, Hash, PartialEq, Debug, Clone, Copy)]
 pub struct Id(u64);
 
 #[derive(Default)]
@@ -28,39 +23,3 @@ impl IdTracker {
         self.free.push(id);
     }
 }
-
-impl Id {
-    /// this must be used carefully to make sure
-    /// all IDs are still valid references;
-    /// named weirdly to indicate this.
-    /// generally should not be used in "user" code
-    pub fn duplicate(&self) -> Self {
-        Self(self.0)
-    }
-
-    /// this must be used carefully to make sure
-    /// all IDs are still valid references.
-    /// generally should not be used in "user" code
-    pub fn copyable(&self) -> CopyId {
-        CopyId(self.0)
-    }
-}
-
-#[derive(Eq, Hash, PartialEq, Debug, Clone, Copy)]
-pub struct CopyId(u64);
-
-impl CopyId {
-    pub fn id(&self) -> Id {
-        Id(self.0)
-    }
-}
-
-pub trait IdUtil {
-    fn duplicate(&self) -> Self;
-}
-
-impl IdUtil for Option<Id> {
-    fn duplicate(&self) -> Self {
-        self.as_ref().map(|i| i.duplicate())
-    }
-}