chore: update to 0.12

src/widget/flex_row/layout.rs

@@ -3,6 +3,7 @@
 
 use crate::{Element, Renderer};
 use iced_core::layout::{Limits, Node};
+use iced_core::widget::Tree;
 use iced_core::{Padding, Point, Size};
 
 pub fn resolve<Message>(
@@ -12,6 +13,7 @@ pub fn resolve<Message>(
     padding: Padding,
     column_spacing: f32,
     row_spacing: f32,
+    tree: &mut [Tree],
 ) -> Node {
     let limits = limits.pad(padding);
 
@@ -26,9 +28,9 @@ pub fn resolve<Message>(
 
     let mut row_buffer = Vec::<Node>::with_capacity(8);
 
-    for child in items {
+    for (child, tree) in items.iter().zip(tree.into_iter()) {
         // Calculate the dimensions of the item.
-        let child_node = child.as_widget().layout(renderer, &limits);
+        let child_node = child.as_widget().layout(tree, renderer, &limits);
         let size = child_node.size();
 
         // Calculate the required additional width to fit the item into the current row.

src/widget/flex_row/widget.rs

@@ -58,7 +58,12 @@ impl<'a, Message: 'static + Clone> Widget<Message, Renderer> for FlexRow<'a, Mes
         Length::Shrink
     }
 
-    fn layout(&self, renderer: &Renderer, limits: &layout::Limits) -> layout::Node {
+    fn layout(
+        &self,
+        tree: &mut Tree,
+        renderer: &Renderer,
+        limits: &layout::Limits,
+    ) -> layout::Node {
         let limits = limits
             .max_width(self.max_width)
             .width(self.width())
@@ -71,6 +76,7 @@ impl<'a, Message: 'static + Clone> Widget<Message, Renderer> for FlexRow<'a, Mes
             self.padding,
             f32::from(self.column_spacing),
             f32::from(self.row_spacing),
+            &mut tree.children,
         )
     }