Fix/improve UiKind

crates/egui/src/ui_stack.rs

@@ -78,14 +78,14 @@ impl UiKind {
             | Self::RightPanel
             | Self::TopPanel
             | Self::BottomPanel
-            | Self::Modal
             | Self::Frame
             | Self::ScrollArea
             | Self::Resize
             | Self::TableCell => false,
 
             Self::Window
             | Self::Menu
+            | Self::Modal
             | Self::Popup
             | Self::Tooltip
             | Self::Picker
@@ -232,6 +232,12 @@ impl UiStack {
         self.kind().map_or(false, |kind| kind.is_panel())
     }
 
+    /// Is this [`crate::Ui`] an [`crate::Area`]?
+    #[inline]
+    pub fn is_area_ui(&self) -> bool {
+        self.kind().map_or(false, |kind| kind.is_area())
+    }
+
     /// Is this a root [`crate::Ui`], i.e. created with [`crate::Ui::new()`]?
     #[inline]
     pub fn is_root_ui(&self) -> bool {