workspace: Close toasts on middle mouse click (#48208)

Release Notes:

- Allow closing notification toasts via middle mouse clicks

crates/workspace/src/toast_layer.rs

@@ -3,7 +3,10 @@ use std::{
     time::{Duration, Instant},
 };
 
-use gpui::{AnyView, DismissEvent, Entity, EntityId, FocusHandle, ManagedView, Subscription, Task};
+use gpui::{
+    AnyView, DismissEvent, Entity, EntityId, FocusHandle, ManagedView, MouseButton, Subscription,
+    Task,
+};
 use ui::{animation::DefaultAnimations, prelude::*};
 use zed_actions::toast;
 
@@ -244,6 +247,12 @@ impl Render for ToastLayer {
                         .on_click(|_, _, cx| {
                             cx.stop_propagation();
                         })
+                        .on_mouse_down(
+                            MouseButton::Middle,
+                            cx.listener(|this, _, _, cx| {
+                                this.hide_toast(cx);
+                            }),
+                        )
                         .child(active_toast.toast.view()),
                 )
                 .animate_in(AnimationDirection::FromBottom, true),