message: Fix selection copying on Windows
  The `copypasta` crate incorrectly mapped the secondary clipboard on
  Windows to the primary clipboard, leading to the primary clipboard
  getting overwritten whenever the selection clipboard was updated.
  The new Windows clipboard mimics the macOS clipboard, which also does
  not have a selection clipboard.
  This fixes
diff: @@ -40,11 +40,6 @@ impl Load for Clipboard {
  let mut ctx: ClipboardContext = ClipboardProvider::new().unwrap();
  ctx.get_contents().map_err(Error::Clipboard)
  }
  -
  - fn load_selection(&self) -> Result<String, Self::Err> {
  - let mut ctx: ClipboardContext = ClipboardProvider::new().unwrap();
  - ctx.get_contents().map_err(Error::Clipboard)
  - }
  }
  impl Store for Clipboard {
  @@ -63,6 +58,7 @@ impl Store for Clipboard {
  where
  S: Into<String>,
  {
  - self.0.set_contents(contents.into()).map_err(Error::Clipboard)
  + // No such thing on Windows
  + Ok(())
  }
  }
  