Derive Clone impl for ranged combinators

plotters/src/coord/ranged1d/combinators/ckps.rs

@@ -13,6 +13,7 @@ use crate::coord::ranged1d::{AsRangedCoord, DiscreteRanged, KeyPointHint, Ranged
 /// for details.
 /// Note: For any coordinate spec wrapped by this decorator, the maximum number of labels configured by
 /// MeshStyle will be ignored and the key point function will always returns the entire vector
+#[derive(Clone)]
 pub struct WithKeyPoints<Inner: Ranged> {
     inner: Inner,
     bold_points: Vec<Inner::ValueType>,

plotters/src/coord/ranged1d/combinators/logarithmic.rs

@@ -151,6 +151,7 @@ impl<V: LogScalable> AsRangedCoord for LogRangeExt<V> {
 }
 
 /// A log scaled coordinate axis
+#[derive(Clone)]
 pub struct LogCoord<V: LogScalable> {
     linear: RangedCoordf64,
     logic: Range<V>,

plotters/src/coord/ranged1d/combinators/nested.rs

@@ -45,6 +45,7 @@ impl<C, V> From<C> for NestedValue<C, V> {
 /// for each value in discrete value, there is a secondary coordinate system.
 /// And the value is defined as a tuple of primary coordinate value and secondary
 /// coordinate value
+#[derive(Clone)]
 pub struct NestedRange<Primary: DiscreteRanged, Secondary: Ranged> {
     primary: Primary,
     secondary: Vec<Secondary>,