Cannot get and set large picture

[ZHLONG-CN]

Try to get a 1.3MB picture from clipboard.
Execute the code, I got

>>> import klembord
... klembord.init()
... clipboard = klembord.get(('image/png',))
... print(len(clipboard['image/png'] or ''))  # clipboard['image/png'] is None
0

When get a 3KB picture is ok.

>>> import klembord
... klembord.init()
... clipboard = klembord.get(('image/png',))
... print(len(clipboard['image/png'] or ''))
3136

Try to set 1.3MB picture to clipboard raise an exception.

>>> klembord.set({'image/png': png, 'TEXT': 'abcd'.encode()})
Exception in thread klembord XSetter server:
Traceback (most recent call last):
  File "/usr/lib/python3.12/threading.py", line 1073, in _bootstrap_inner
    self.run()
  File "/usr/lib/python3.12/threading.py", line 1010, in run
    self._target(*self._args, **self._kwargs)
  File ".../site-packages/klembord/xclipboard.py", line 221, in serve
    client_prop = process_request(
                  ^^^^^^^^^^^^^^^^
  File ".../site-packages/klembord/xclipboard.py", line 301, in process_request
    client.change_property(
  File ".../site-packages/Xlib/xobject/drawable.py", line 430, in change_property
    request.ChangeProperty(display = self.display,
  File ".../site-packages/Xlib/protocol/rq.py", line 1347, in __init__
    self._binary = self._request.to_binary(*args, **keys)
                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File ".../site-packages/Xlib/protocol/rq.py", line 1069, in to_binary
    static_part = struct.pack(self.static_codes, *pack_items)
                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
struct.error: 'H' format requires 0 <= number <= 65535

Try to set 3KB picture to clipboard is ok but need time.sleep:

>>> klembord.set({'image/png': png_, 'TEXT': 'abcd'.encode()})
... time.sleep(1)
... clipboard = klembord.get(('image/png',))
... print(len(clipboard['image/png'] or ''))
3136

Without time.sleep, the result turns out abnormal and kinda randomly, I even can't reproduce.

>>> klembord.set({'image/png': png_, 'TEXT': 'abcd'.encode()})
... clipboard = klembord.get(('image/png',))
... print(len(clipboard['image/png'] or ''))
13861