From 9b08329319db71bc8a46294caa91d37497cd3ba8 Mon Sep 17 00:00:00 2001
From: msiglreith <m.siglreith@gmail.com>
Date: Mon, 3 Jan 2022 14:58:04 +0100
Subject: [PATCH 1/2] example: only redraw when requested by the event loop.

Fixes hangs in case of non-Mailbox present modes.
---
 examples/src/lib.rs | 34 +++++++++++++++++-----------------
 1 file changed, 17 insertions(+), 17 deletions(-)

diff --git a/examples/src/lib.rs b/examples/src/lib.rs
index ab087e949..5222f8603 100644
--- a/examples/src/lib.rs
+++ b/examples/src/lib.rs
@@ -185,23 +185,23 @@ impl ExampleBase {
             .borrow_mut()
             .run_return(|event, _, control_flow| {
                 *control_flow = ControlFlow::Wait;
-                f();
-                if let Event::WindowEvent {
-                    event:
-                        WindowEvent::CloseRequested
-                        | WindowEvent::KeyboardInput {
-                            input:
-                                KeyboardInput {
-                                    state: ElementState::Pressed,
-                                    virtual_keycode: Some(VirtualKeyCode::Escape),
-                                    ..
-                                },
-                            ..
-                        },
-                    ..
-                } = event
-                {
-                    *control_flow = ControlFlow::Exit
+                match event {
+                    Event::WindowEvent {
+                        event:
+                            WindowEvent::CloseRequested
+                            | WindowEvent::KeyboardInput {
+                                input:
+                                    KeyboardInput {
+                                        state: ElementState::Pressed,
+                                        virtual_keycode: Some(VirtualKeyCode::Escape),
+                                        ..
+                                    },
+                                ..
+                            },
+                        ..
+                    } => *control_flow = ControlFlow::Exit,
+                    Event::RedrawRequested(_) => f(),
+                    _ => (),
                 }
             });
     }

From 70b15478bd07885868645e566674f05dbdc28a33 Mon Sep 17 00:00:00 2001
From: msiglreith <m.siglreith@gmail.com>
Date: Mon, 3 Jan 2022 22:30:04 +0100
Subject: [PATCH 2/2] example: switch to continuous redrawing using Poll and
 MainEventsCleared

---
 examples/src/lib.rs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/examples/src/lib.rs b/examples/src/lib.rs
index 5222f8603..e88da2b3c 100644
--- a/examples/src/lib.rs
+++ b/examples/src/lib.rs
@@ -184,7 +184,7 @@ impl ExampleBase {
         self.event_loop
             .borrow_mut()
             .run_return(|event, _, control_flow| {
-                *control_flow = ControlFlow::Wait;
+                *control_flow = ControlFlow::Poll;
                 match event {
                     Event::WindowEvent {
                         event:
@@ -200,7 +200,7 @@ impl ExampleBase {
                             },
                         ..
                     } => *control_flow = ControlFlow::Exit,
-                    Event::RedrawRequested(_) => f(),
+                    Event::MainEventsCleared => f(),
                     _ => (),
                 }
             });