[rs] Merge gfx-rs#753

753: Use max function to ensure that the swapchain size is not less than 1. r=kvark a=Tnze

ATT

Co-authored-by: Tnze <cjd001113@outlook.com>

wgpu/examples/framework.rs

@@ -255,8 +255,8 @@ fn start<E: Example>(
                 ..
             } => {
                 log::info!("Resizing to {:?}", size);
-                sc_desc.width = if size.width == 0 { 1 } else { size.width };
-                sc_desc.height = if size.height == 0 { 1 } else { size.height };
+                sc_desc.width = size.width.max(1);
+                sc_desc.height = size.height.max(1);
                 example.resize(&sc_desc, &device, &queue);
                 swap_chain = device.create_swap_chain(&surface, &sc_desc);
             }