Add `PlotUi::response()` to replace `plot_clicked()` etc (#3223)

Closes https://github.com/emilk/egui/pull/2571

crates/egui/src/widgets/plot/mod.rs

@@ -1081,17 +1081,25 @@ impl PlotUi {
             .push(BoundsModification::Translate(delta_pos));
     }
 
+    /// Can be used to check if the plot was hovered or clicked.
+    pub fn response(&self) -> &Response {
+        &self.response
+    }
+
     /// Returns `true` if the plot area is currently hovered.
+    #[deprecated = "Use plot_ui.response().hovered()"]
     pub fn plot_hovered(&self) -> bool {
         self.response.hovered()
     }
 
     /// Returns `true` if the plot was clicked by the primary button.
+    #[deprecated = "Use plot_ui.response().clicked()"]
     pub fn plot_clicked(&self) -> bool {
         self.response.clicked()
     }
 
     /// Returns `true` if the plot was clicked by the secondary button.
+    #[deprecated = "Use plot_ui.response().secondary_clicked()"]
     pub fn plot_secondary_clicked(&self) -> bool {
         self.response.secondary_clicked()
     }

crates/egui_demo_lib/src/demo/plot_demo.rs

@@ -761,7 +761,7 @@ impl InteractionDemo {
                 plot_ui.pointer_coordinate(),
                 plot_ui.pointer_coordinate_drag_delta(),
                 plot_ui.plot_bounds(),
-                plot_ui.plot_hovered(),
+                plot_ui.response().hovered(),
             )
         });