Default to vsync for OpenGL rendering

Fixes #3516

(cherry picked from commit fd123b27bd)

internal/backends/winit/renderer/femtovg/glcontext.rs

@@ -179,6 +179,14 @@ impl OpenGLContext {
             );
         }
 
+        // Try to default to vsync and ignore if the driver doesn't support it.
+        surface
+            .set_swap_interval(
+                &context,
+                glutin::surface::SwapInterval::Wait(NonZeroU32::new(1).unwrap()),
+            )
+            .ok();
+
         Ok((window, Self { context, surface }))
     }
 }

internal/renderers/skia/opengl_surface.rs

@@ -340,6 +340,14 @@ impl OpenGLSurface {
             .into());
         }
 
+        // Try to default to vsync and ignore if the driver doesn't support it.
+        surface
+            .set_swap_interval(
+                &context,
+                glutin::surface::SwapInterval::Wait(NonZeroU32::new(1).unwrap()),
+            )
+            .ok();
+
         Ok((context, surface))
     }