Improve drag and drop to look and feel better

WIP: Change rendering of drag and drop based on alt-modifier

crates/workspace/src/workspace.rs

@@ -33,8 +33,8 @@ use gpui::{
     },
     impl_actions,
     platform::{
-        CursorStyle, MouseButton, PathPromptOptions, Platform, PromptLevel, WindowBounds,
-        WindowOptions,
+        CursorStyle, ModifiersChangedEvent, MouseButton, PathPromptOptions, Platform, PromptLevel,
+        WindowBounds, WindowOptions,
     },
     AnyModelHandle, AnyViewHandle, AnyWeakViewHandle, AppContext, AsyncAppContext, Entity,
     ModelContext, ModelHandle, SizeConstraint, Subscription, Task, View, ViewContext, ViewHandle,
@@ -3807,6 +3807,10 @@ impl View for Workspace {
             cx.focus(&self.active_pane);
         }
     }
+
+    fn modifiers_changed(&mut self, e: &ModifiersChangedEvent, cx: &mut ViewContext<Self>) -> bool {
+        DragAndDrop::<Workspace>::update_modifiers(e.modifiers, cx)
+    }
 }
 
 impl ViewId {