Fix 2583. (#2584)

* fix triangle-util and viewport extent docs

* fmt

* Revert "fmt"

This reverts commit 516b11b3ee.

* Revert "fix triangle-util and viewport extent docs"

This reverts commit b70ebad5ba.

* Marc's better way.

examples/triangle-util/main.rs

@@ -369,6 +369,7 @@ impl ApplicationHandler for App {
                         // and the dynamic state viewport.
                         rcx.framebuffers =
                             window_size_dependent_setup(swapchain_images, &rcx.render_pass);
+                        rcx.viewport.extent = window_size.into();
                     })
                     .unwrap();