Do not panic when device().poll() times out

crates/anyrender_vello/CHANGELOG.md

@@ -5,6 +5,12 @@ All notable changes to this crate are documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [Unreleased]
+
+### Fixed
+
+- A `wgpu::PollError::Timeout` from the completion `poll` at the end of `WindowRenderer::render` no longer panics. The frame has already been presented at that point, so the error is dropped instead of bringing the process down (#96).
+
 ## [0.14.0] - 2026-08-16
 
 ### Added

crates/anyrender_vello/src/window_renderer.rs

@@ -487,10 +487,14 @@ impl WindowRenderer for VelloWindowRenderer {
         }
         timer.record_time("present");
 
-        render_surface
+        // A timeout here means the driver has not signalled the submission
+        // complete. The frame has already been presented, so there is nothing to
+        // retry and nothing to skip; carrying on is strictly better than
+        // bringing the process down. Same reasoning as the
+        // `maybe_blit_and_present` check above.
+        let _ = render_surface
             .device()
-            .poll(wgpu::PollType::wait_indefinitely())
-            .unwrap();
+            .poll(wgpu::PollType::wait_indefinitely());
 
         timer.record_time("wait");
         timer.print_times("vello: ");

crates/anyrender_vello_hybrid/CHANGELOG.md

@@ -5,6 +5,12 @@ All notable changes to this crate are documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [Unreleased]
+
+### Fixed
+
+- A `wgpu::PollError::Timeout` from the completion `poll` at the end of `WindowRenderer::render` no longer panics. The frame has already been presented at that point, so the error is dropped instead of bringing the process down (#96).
+
 ## [0.10.0] - 2026-08-16
 
 ### Changed

crates/anyrender_vello_hybrid/src/window_renderer.rs

@@ -539,10 +539,14 @@ impl WindowRenderer for VelloHybridWindowRenderer {
         }
         timer.record_time("present");
 
-        render_surface
+        // A timeout here means the driver has not signalled the submission
+        // complete. The frame has already been presented, so there is nothing to
+        // retry and nothing to skip; carrying on is strictly better than
+        // bringing the process down. Same reasoning as the
+        // `maybe_blit_and_present` check above.
+        let _ = render_surface
             .device()
-            .poll(wgpu::PollType::wait_indefinitely())
-            .unwrap();
+            .poll(wgpu::PollType::wait_indefinitely());
 
         timer.record_time("wait");
         timer.print_times("vello_hybrid: ");