Fix pane grid mouse interactions

- Use `grabbing` interaction while dragging
- Ignore grab interaction when dragging is disabled

native/src/widget/pane_grid.rs

@@ -341,6 +341,7 @@ where
                         cursor_position,
                         viewport,
                         renderer,
+                        self.on_drag.is_some(),
                     )
                 })
                 .max()
@@ -648,7 +649,7 @@ pub fn mouse_interaction(
     resize_leeway: Option<u16>,
 ) -> Option<mouse::Interaction> {
     if action.picked_pane().is_some() {
-        return Some(mouse::Interaction::Grab);
+        return Some(mouse::Interaction::Grabbing);
     }
 
     let resize_axis =

native/src/widget/pane_grid/content.rs

@@ -238,6 +238,7 @@ where
         cursor_position: Point,
         viewport: &Rectangle,
         renderer: &Renderer,
+        drag_enabled: bool,
     ) -> mouse::Interaction {
         let (body_layout, title_bar_interaction) =
             if let Some(title_bar) = &self.title_bar {
@@ -247,7 +248,7 @@ where
                 let is_over_pick_area = title_bar
                     .is_over_pick_area(title_bar_layout, cursor_position);
 
-                if is_over_pick_area {
+                if is_over_pick_area && drag_enabled {
                     return mouse::Interaction::Grab;
                 }