myclaude -r: 修快速连按方向键被退出 + 隐藏光标 + 退出删除行不留空行

- _read_key 改按需读 CSI 序列（方向键读到终止符即返回），连按 \x1b[B 不再被吞进同一序列误判为 ESC 退出
- picker 全程隐藏光标（\x1b[?25l），退出恢复（\x1b[?25h），末尾不再突兀闪现光标
- 退出改用 Delete Line（\x1b[{n}M）删除块区域，替代逐行清空，不再留下 N 个空行
- tests: 新增快速连按方向键回归测试

myagents/launcher.py

@@ -829,6 +829,12 @@ def _read_key(fd: int, timeout: float = 0.3) -> str:
 
     Handles single bytes (q, digits, Enter) and multi-byte escape sequences
     (arrow keys, PageUp/PageDown). Returns "timeout" when idle.
+
+    Escape sequences are consumed greedily but only up to the terminating
+    byte (``[A``/``[B``… or ``[5~``/``[6~``) — any further bytes belong to the
+    next keypress and are left in the buffer. This keeps rapid arrow-key
+    repeats from being merged into one unknown sequence (which would read as
+    ESC and quit the picker).
     """
     readable, _, _ = select.select([fd], [], [], timeout)
     if not readable:
@@ -838,20 +844,7 @@ def _read_key(fd: int, timeout: float = 0.3) -> str:
     except OSError:
         return "quit"
     if first == b"\x1b":
-        seq = first
-        for _ in range(8):
-            readable, _, _ = select.select([fd], [], [], 0.1)
-            if not readable:
-                break
-            seq += os.read(fd, 1)
-        return {
-            b"\x1b[A": "up",
-            b"\x1b[B": "down",
-            b"\x1b[C": "right",
-            b"\x1b[D": "left",
-            b"\x1b[5~": "pgup",
-            b"\x1b[6~": "pgdown",
-        }.get(seq, "esc")
+        return _read_escape_seq(fd)
     if first in (b"\r", b"\n"):
         return "enter"
     if first in (b"q", b"Q"):
@@ -865,6 +858,41 @@ def _read_key(fd: int, timeout: float = 0.3) -> str:
     return "other"
 
 
+def _read_escape_seq(fd: int) -> str:
+    """Read one CSI escape sequence (``ESC [`` …), returning a symbolic key.
+
+    Reads only the bytes of one sequence: arrow keys are ``ESC [ A-D`` (3
+    bytes), PgUp/PgDn are ``ESC [ 5~`` / ``ESC [ 6~`` (4 bytes). It never
+    reads past the terminator, so rapid back-to-back arrow keys stay distinct
+    and don't merge into one unknown sequence (which would read as ESC).
+    """
+    bracket = _read_byte_or_none(fd, 0.05)
+    if bracket != b"[":
+        return "esc"  # bare ESC or unknown prefix
+    nxt = _read_byte_or_none(fd, 0.05)
+    if nxt is None:
+        return "esc"
+    if nxt in (b"A", b"B", b"C", b"D"):
+        return {"A": "up", "B": "down", "C": "right", "D": "left"}[nxt.decode()]
+    if nxt in (b"5", b"6"):
+        term = _read_byte_or_none(fd, 0.05)
+        if term == b"~":
+            return "pgup" if nxt == b"5" else "pgdown"
+        return "esc"
+    return "esc"
+
+
+def _read_byte_or_none(fd: int, timeout: float) -> bytes | None:
+    """Read one byte within ``timeout``, or None if nothing arrives."""
+    readable, _, _ = select.select([fd], [], [], timeout)
+    if not readable:
+        return None
+    try:
+        return os.read(fd, 1)
+    except OSError:
+        return None
+
+
 def _picker_advance(
     state: _PickerState, key: str
 ) -> tuple[_PickerState, str, ClaudeSessionRow | str | None]:
@@ -1016,11 +1044,14 @@ def _draw_picker_block(lines: list[str], prev_height: int) -> None:
 
 
 def _clear_picker_block(prev_height: int) -> None:
-    """Blank the picker block lines before exiting so no residue remains."""
+    """Delete the picker block lines before exiting so no residue remains.
+
+    Uses Delete Line (``CSI n M``) rather than blanking lines, so the block
+    disappears entirely instead of leaving N empty rows below the prompt.
+    """
     if prev_height:
         sys.stdout.write(f"\x1b[{prev_height}A")
-    for _ in range(prev_height):
-        sys.stdout.write("\r\x1b[2K\n")
+        sys.stdout.write(f"\x1b[{prev_height}M")
     sys.stdout.flush()
 
 
@@ -1038,6 +1069,8 @@ def _pick_session(
     prev_height = 0
     try:
         tty.setraw(fd)
+        sys.stdout.write("\x1b[?25l")  # hide cursor while the picker owns the block
+        sys.stdout.flush()
         while True:
             lines = _picker_block(state, chat_cwd, message)
             _draw_picker_block(lines, prev_height)
@@ -1055,6 +1088,8 @@ def _pick_session(
                 _clear_picker_block(prev_height)
                 return None
     finally:
+        sys.stdout.write("\x1b[?25h")  # restore cursor on the way out
+        sys.stdout.flush()
         termios.tcsetattr(fd, termios.TCSADRAIN, old)
 
 

tests/test_launcher_sessions.py

@@ -340,3 +340,18 @@ class TestReadKey:
 
     def test_escape(self) -> None:
         assert _read_key_from_bytes(b"\x1b") == "esc"
+
+    def test_rapid_arrows_not_merged(self) -> None:
+        """Back-to-back arrow keys stay distinct (no bleed into one ESC)."""
+        r, w = os.pipe()
+        try:
+            # 4 rapid down presses back-to-back, exactly as the terminal sends them
+            os.write(w, b"\x1b[B" * 4)
+            keys = [L._read_key(r) for _ in range(4)]
+            assert keys == ["down"] * 4
+            # bare ESC still reads as its own key afterwards
+            os.write(w, b"\x1b")
+            assert L._read_key(r) == "esc"
+        finally:
+            os.close(r)
+            os.close(w)