gh-146589: Fix raw buffer merge in UnixConsole.getpending()

When coalescing queued input events, append e2.raw to e.raw instead of
duplicating e.raw (e.raw += e.raw was incorrect).

Author: cuiweixie

Lib/_pyrepl/unix_console.py

@@ -542,7 +542,7 @@ def getpending(self):
             while not self.event_queue.empty():
                 e2 = self.event_queue.get()
                 e.data += e2.data
-                e.raw += e.raw
+                e.raw += e2.raw
 
             amount = struct.unpack("i", ioctl(self.input_fd, FIONREAD, b"\0\0\0\0"))[0]
             trace("getpending({a})", a=amount)