fix DISPLAY=unix:[0-9]+ parsing

Author: elric1

x11rb-protocol/src/parse_display/connect_instruction.rs

@@ -97,6 +97,15 @@ mod tests {
         assert_eq!(ci, vec![ConnectAddress::Socket("/tmp/.X11-unix/X0".into())]);
     }
 
+    #[test]
+    fn try_over_unix_display() {
+        let pd = parse_display_with_file_exists_callback("unix:11.0", |_| false).unwrap();
+        let ci = pd.connect_instruction();
+        let ci = ci.collect::<Vec<_>>();
+
+        assert_eq!(ci, vec![ConnectAddress::Socket("/tmp/.X11-unix/X11".into())]);
+    }
+
     #[test]
     fn try_over_unix_socket_path() {
         const SOCKET_PATH: &str = "/path/to/socket";

x11rb-protocol/src/parse_display/mod.rs

@@ -73,7 +73,9 @@ pub fn parse_display_with_file_exists_callback(
         return parse_display_direct_path(dpy_name, file_exists);
     }
     if let Some(remaining) = dpy_name.strip_prefix("unix:") {
-        return parse_display_direct_path(remaining, file_exists);
+        if let Ok(display) = parse_display_direct_path(remaining, &file_exists) {
+            return Ok(display);
+        }
     }
 
     // Everything up to the last '/' is the protocol. This part is optional.