Suppress spurious x11_clipboard Error::Owner errors

The x11_clipboard::Clipboard::store() method has a racy ownership check
that is causing spurious warnings to be emitted in alacritty [0].
x11_clipboard is unwilling to accept a fix for the issue [1], citing
"maintenance mode".
Let's do the next best thing and ignore the error in our clipboard
wrapper: for our intents and purposes this variant serves no purpose,
because it only detects clipboard ownership changes *after* contents
have already been stored, at which point the job could equally well be
considered done.

[0] alacritty/alacritty#6978
[1] quininer/x11-clipboard#53

Fixes: alacritty/alacritty#6978

Signed-off-by: Daniel Müller <deso@posteo.net>

Author: d-e-s-o

src/x11_clipboard.rs

@@ -16,6 +16,7 @@ use std::marker::PhantomData;
 use std::time::Duration;
 
 use x11_clipboard::Atom;
+use x11_clipboard::error::Error;
 use x11_clipboard::{Atoms, Clipboard as X11Clipboard};
 
 use crate::common::*;
@@ -67,6 +68,14 @@ where
     }
 
     fn set_contents(&mut self, data: String) -> Result<()> {
-        Ok(self.0.store(S::atom(&self.0.setter.atoms), self.0.setter.atoms.utf8_string, data)?)
+        self.0
+            .store(S::atom(&self.0.setter.atoms), self.0.setter.atoms.utf8_string, data)
+            .or_else(|err| match err {
+                // The `Owner` error can be spurious, caused by a racy
+                // ownership check. The "store" will still have
+                // happened, so it is safe to ignore.
+                Error::Owner => Ok(()),
+                e => Err(e.into()),
+            })
     }
 }