Add Zoom Factor to options panel (#7517)

crates/epaint/src/stats.rs

@@ -3,19 +3,14 @@
 use crate::{ClippedShape, Galley, Mesh, Primitive, Shape};
 
 /// Size of the elements in a vector/array.
-#[derive(Clone, Copy, PartialEq)]
+#[derive(Clone, Copy, Default, PartialEq)]
 enum ElementSize {
+    #[default]
     Unknown,
     Homogeneous(usize),
     Heterogenous,
 }
 
-impl Default for ElementSize {
-    fn default() -> Self {
-        Self::Unknown
-    }
-}
-
 /// Aggregate information about a bunch of allocations.
 #[derive(Clone, Copy, Default, PartialEq)]
 pub struct AllocInfo {