gh-145886: Fix e.raw += e.raw typo in UnixConsole.getpending

In both variants of getpending(), the raw bytes from queued events
were being accumulated incorrectly: e.raw was being added to itself
instead of accumulating e2.raw from the dequeued event. This meant
the combined event's raw field would always be empty bytes (since it
starts as b"" and b"" + b"" is b"").

Fix the typo so that e.raw += e2.raw is used, matching the pattern
already used for e.data += e2.data on the preceding line.

Also add a test that verifies getpending correctly accumulates raw
bytes from multiple queued events.

Author: Carson Jones

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)
@@ -566,7 +566,7 @@ 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 = 10000
             raw = self.__read(amount)

Lib/test/test_pyrepl/test_unix_console.py

@@ -400,3 +400,30 @@ def test_repl_eio(self):
             ),
             f"Expected EIO/ENXIO error message in stderr: {err}",
         )
+
+
+@unittest.skipIf(sys.platform == "win32", "No Unix console on Windows")
+class TestGetPending(TestCase):
+    def test_getpending_accumulates_raw_from_queued_events(self):
+        # gh-145886: getpending was adding e.raw to itself instead of e2.raw
+        console = UnixConsole.__new__(UnixConsole)
+        console.encoding = "utf-8"
+        console.input_fd = 0
+
+        ev1 = Event("key", "a", b"x")
+        ev2 = Event("key", "b", b"y")
+        queue = [ev1, ev2]
+
+        mock_eq = MagicMock()
+        mock_eq.empty = lambda: len(queue) == 0
+        mock_eq.get = lambda: queue.pop(0)
+        console.event_queue = mock_eq
+
+        # Mock __read to return empty bytes (no additional pending input)
+        console._UnixConsole__read = lambda n: b""
+
+        with patch("_pyrepl.unix_console.ioctl", return_value=b"\0\0\0\0"):
+            result = console.getpending()
+
+        self.assertEqual(result.data, "ab")
+        self.assertEqual(result.raw, b"xy")