Implement `hash_layout` for `pane_grid::TitleBar`

native/src/widget/pane_grid/content.rs

@@ -183,6 +183,10 @@ where
     }
 
     pub(crate) fn hash_layout(&self, state: &mut Hasher) {
+        if let Some(title_bar) = &self.title_bar {
+            title_bar.hash_layout(state);
+        }
+
         self.body.hash_layout(state);
     }
 

native/src/widget/pane_grid/title_bar.rs

@@ -1,6 +1,8 @@
 use crate::layout;
 use crate::pane_grid;
-use crate::{Clipboard, Element, Event, Layout, Point, Rectangle, Size};
+use crate::{
+    Clipboard, Element, Event, Hasher, Layout, Point, Rectangle, Size,
+};
 
 /// The title bar of a [`Pane`].
 ///
@@ -176,6 +178,14 @@ where
         }
     }
 
+    pub(crate) fn hash_layout(&self, hasher: &mut Hasher) {
+        use std::hash::Hash;
+
+        self.title.hash(hasher);
+        self.title_size.hash(hasher);
+        self.padding.hash(hasher);
+    }
+
     pub(crate) fn layout(
         &self,
         renderer: &Renderer,