Add a Buffer::present_with_damage() method

Supported on Wayland, X11, and Win32.

Fixes https://github.com/rust-windowing/softbuffer/issues/39.

try_for_each

src/web.rs

@@ -9,7 +9,7 @@ use web_sys::HtmlCanvasElement;
 use web_sys::ImageData;
 
 use crate::error::SwResultExt;
-use crate::SoftBufferError;
+use crate::{Rect, SoftBufferError};
 use std::convert::TryInto;
 use std::num::NonZeroU32;
 
@@ -153,6 +153,10 @@ impl<'a> BufferImpl<'a> {
 
         Ok(())
     }
+
+    pub fn present_with_damage(self, _damage: &[Rect]) -> Result<(), SoftBufferError> {
+        self.present()
+    }
 }
 
 #[inline(always)]