Fix clipboard decode-error when using command /paste

aider/copypaste.py

@@ -18,12 +18,16 @@ def __init__(self, io, verbose=False):
     def start(self):
         """Start watching clipboard for changes"""
         self.stop_event = threading.Event()
-        self.last_clipboard = pyperclip.paste()
+        # guard against non-UTF8 bytes in the clipboard
+        try:
+            self.last_clipboard = pyperclip.paste()
+        except UnicodeDecodeError:
+            self.last_clipboard = ""
 
         def watch_clipboard():
             while not self.stop_event.is_set():
                 try:
-                    current = pyperclip.paste()
+                    current = self._safe_paste()
                     if current != self.last_clipboard:
                         self.last_clipboard = current
                         self.io.interrupt_input()
@@ -51,6 +55,23 @@ def stop(self):
             self.watcher_thread = None
             self.stop_event = None
 
+    def _safe_paste(self) -> str:
+        """
+        Attempt a normal pyperclip.paste(); if it raises a UnicodeDecodeError
+        fall back to a raw xclip call and replace invalid bytes.
+        """
+        try:
+            return pyperclip.paste()
+        except UnicodeDecodeError:
+            # linux fallback via xclip
+            import subprocess, shlex
+            try:
+                raw = subprocess.check_output(shlex.split("xclip -selection clipboard -o"))
+                # replace any invalid bytes with �
+                return raw.decode("utf-8", errors="replace")
+            except Exception:
+                return ""
+
 
 def main():
     """Example usage of the clipboard watcher"""