roll back mouse position in mouse_state struct in favor of using the dragged element position

crates/gpui/src/app.rs

@@ -3908,7 +3908,6 @@ pub struct RenderContext<'a, T: View> {
     pub(crate) window_id: usize,
     pub(crate) view_id: usize,
     pub(crate) view_type: PhantomData<T>,
-    pub(crate) mouse_position: Vector2F,
     pub(crate) hovered_region_ids: HashSet<MouseRegionId>,
     pub(crate) clicked_region_ids: Option<(HashSet<MouseRegionId>, MouseButton)>,
     pub app: &'a mut MutableAppContext,
@@ -3920,19 +3919,12 @@ pub struct RenderContext<'a, T: View> {
 #[derive(Clone, Default)]
 pub struct MouseState {
     hovered: bool,
-    mouse_position: Vector2F,
     clicked: Option<MouseButton>,
-    accessed_mouse_position: bool,
     accessed_hovered: bool,
     accessed_clicked: bool,
 }
 
 impl MouseState {
-    pub fn mouse_position(&mut self) -> Vector2F {
-        self.accessed_mouse_position = true;
-        self.mouse_position
-    }
-
     pub fn hovered(&mut self) -> bool {
         self.accessed_hovered = true;
         self.hovered
@@ -3943,10 +3935,6 @@ impl MouseState {
         self.clicked
     }
 
-    pub fn accessed_mouse_position(&self) -> bool {
-        self.accessed_mouse_position
-    }
-
     pub fn accessed_hovered(&self) -> bool {
         self.accessed_hovered
     }
@@ -3964,7 +3952,6 @@ impl<'a, V: View> RenderContext<'a, V> {
             view_id: params.view_id,
             view_type: PhantomData,
             titlebar_height: params.titlebar_height,
-            mouse_position: params.mouse_position,
             hovered_region_ids: params.hovered_region_ids.clone(),
             clicked_region_ids: params.clicked_region_ids.clone(),
             refreshing: params.refreshing,
@@ -3987,7 +3974,6 @@ impl<'a, V: View> RenderContext<'a, V> {
     pub fn mouse_state<Tag: 'static>(&self, region_id: usize) -> MouseState {
         let region_id = MouseRegionId::new::<Tag>(self.view_id, region_id);
         MouseState {
-            mouse_position: self.mouse_position.clone(),
             hovered: self.hovered_region_ids.contains(&region_id),
             clicked: self.clicked_region_ids.as_ref().and_then(|(ids, button)| {
                 if ids.contains(&region_id) {
@@ -3996,7 +3982,6 @@ impl<'a, V: View> RenderContext<'a, V> {
                     None
                 }
             }),
-            accessed_mouse_position: false,
             accessed_hovered: false,
             accessed_clicked: false,
         }

crates/gpui/src/app/test_app_context.rs

@@ -186,7 +186,6 @@ impl TestAppContext {
                 view_id: handle.id(),
                 view_type: PhantomData,
                 titlebar_height: 0.,
-                mouse_position: Default::default(),
                 hovered_region_ids: Default::default(),
                 clicked_region_ids: None,
                 refreshing: false,

crates/gpui/src/elements/mouse_event_handler.rs

@@ -21,7 +21,6 @@ pub struct MouseEventHandler<Tag: 'static> {
     cursor_style: Option<CursorStyle>,
     handlers: HandlerSet,
     hoverable: bool,
-    notify_on_move: bool,
     notify_on_hover: bool,
     notify_on_click: bool,
     above: bool,
@@ -39,7 +38,6 @@ impl<Tag> MouseEventHandler<Tag> {
     {
         let mut mouse_state = cx.mouse_state::<Tag>(region_id);
         let child = render_child(&mut mouse_state, cx);
-        let notify_on_move = mouse_state.accessed_mouse_position();
         let notify_on_hover = mouse_state.accessed_hovered();
         let notify_on_click = mouse_state.accessed_clicked();
         Self {
@@ -47,7 +45,6 @@ impl<Tag> MouseEventHandler<Tag> {
             region_id,
             cursor_style: None,
             handlers: Default::default(),
-            notify_on_move,
             notify_on_hover,
             notify_on_click,
             hoverable: true,
@@ -188,7 +185,6 @@ impl<Tag> MouseEventHandler<Tag> {
                 self.handlers.clone(),
             )
             .with_hoverable(self.hoverable)
-            .with_notify_on_move(self.notify_on_move)
             .with_notify_on_hover(self.notify_on_hover)
             .with_notify_on_click(self.notify_on_click),
         );

crates/gpui/src/presenter.rs

@@ -185,7 +185,6 @@ impl Presenter {
             asset_cache: &self.asset_cache,
             view_stack: Vec::new(),
             refreshing,
-            mouse_position: self.mouse_position.clone(),
             hovered_region_ids: self.hovered_region_ids.clone(),
             clicked_region_ids: self
                 .clicked_button
@@ -568,7 +567,6 @@ pub struct LayoutContext<'a> {
     pub window_size: Vector2F,
     titlebar_height: f32,
     appearance: Appearance,
-    mouse_position: Vector2F,
     hovered_region_ids: HashSet<MouseRegionId>,
     clicked_region_ids: Option<(HashSet<MouseRegionId>, MouseButton)>,
 }
@@ -640,7 +638,6 @@ impl<'a> LayoutContext<'a> {
                 view_id: handle.id(),
                 view_type: PhantomData,
                 titlebar_height: self.titlebar_height,
-                mouse_position: self.mouse_position.clone(),
                 hovered_region_ids: self.hovered_region_ids.clone(),
                 clicked_region_ids: self.clicked_region_ids.clone(),
                 refreshing: self.refreshing,

crates/gpui/src/scene/mouse_region.rs

@@ -138,11 +138,6 @@ impl MouseRegion {
         self
     }
 
-    pub fn with_notify_on_move(mut self, notify: bool) -> Self {
-        self.notify_on_move = notify;
-        self
-    }
-
     pub fn with_notify_on_hover(mut self, notify: bool) -> Self {
         self.notify_on_hover = notify;
         self

crates/workspace/src/pane/dragged_item_receiver.rs

@@ -33,7 +33,7 @@ where
             .global::<DragAndDrop<Workspace>>()
             .currently_dragged::<DraggedItem>(cx.window_id())
             .filter(|_| hovered)
-            .map(|_| state.mouse_position());
+            .map(|(drag_position, _)| drag_position);
 
         Stack::new()
             .with_child(render_child(state, cx))
@@ -69,6 +69,15 @@ where
             cx.notify();
         }
     })
+    .on_move(|_, cx| {
+        if cx
+            .global::<DragAndDrop<Workspace>>()
+            .currently_dragged::<DraggedItem>(cx.window_id())
+            .is_some()
+        {
+            cx.notify();
+        }
+    })
 }
 
 pub fn handle_dropped_item(