Treat Event::PointerGone as PointerEvent::Released (#4419)

* Closes #4406
* Closes #4418 

If `Event::PointerGone` occurs, it is treated as
`PointerEvent::Released`.

crates/egui/src/context.rs

@@ -1875,8 +1875,8 @@ impl Context {
                     drag_started: _,
                     dragged,
                     drag_stopped: _,
-                    contains_pointer,
                     hovered,
+                    contains_pointer,
                 } = interact_widgets;
 
                 if true {

crates/egui/src/input_state.rs

@@ -800,6 +800,10 @@ impl PointerState {
                 }
                 Event::PointerGone => {
                     self.latest_pos = None;
+                    self.pointer_events.push(PointerEvent::Released {
+                        click: None,
+                        button: PointerButton::Primary,
+                    });
                     // NOTE: we do NOT clear `self.interact_pos` here. It will be cleared next frame.
                 }
                 Event::MouseMoved(delta) => *self.motion.get_or_insert(Vec2::ZERO) += *delta,

crates/egui/src/interaction.rs

@@ -283,7 +283,7 @@ pub(crate) fn interact(
         drag_started,
         dragged,
         drag_stopped,
-        contains_pointer,
         hovered,
+        contains_pointer,
     }
 }

crates/egui_demo_lib/src/demo/tests.rs

@@ -466,23 +466,23 @@ fn response_summary(response: &egui::Response, show_hovers: bool) -> String {
         // These are in inverse logical/chonological order, because we show them in the ui that way:
 
         if response.triple_clicked_by(button) {
-            writeln!(new_info, "Triple-clicked{button_suffix}").ok();
+            writeln!(new_info, "Triple_clicked_by{button_suffix}").ok();
         }
         if response.double_clicked_by(button) {
-            writeln!(new_info, "Double-clicked{button_suffix}").ok();
+            writeln!(new_info, "Double_clicked_by{button_suffix}").ok();
         }
         if response.clicked_by(button) {
-            writeln!(new_info, "Clicked{button_suffix}").ok();
+            writeln!(new_info, "Clicked_by{button_suffix}").ok();
         }
 
         if response.drag_stopped_by(button) {
-            writeln!(new_info, "Drag stopped{button_suffix}").ok();
+            writeln!(new_info, "Drag_stopped_by{button_suffix}").ok();
         }
         if response.dragged_by(button) {
-            writeln!(new_info, "Dragged{button_suffix}").ok();
+            writeln!(new_info, "Dragged_by{button_suffix}").ok();
         }
         if response.drag_started_by(button) {
-            writeln!(new_info, "Drag started{button_suffix}").ok();
+            writeln!(new_info, "Drag_started_by{button_suffix}").ok();
         }
     }