AttributeError after closing all files in a new editor window

[VeloSteve]

Description

What steps will reproduce the problem?

Edit two python files in a single window.
Right click the tab for one of them and select New window.
Now there are two windows, both showing both files.
In the new window, close one file. It disappears from both.
In the new window, close the second file. The error which led me this dialog occurs.
Now both windows have an untitled[n] file which wasn't there before.

What I really wanted was one file in each window, but even if I did that incorrectly, this should not happen.

Traceback

Traceback (most recent call last):
  File "C:\Program Files\Spyder\pkgs\spyder\plugins\editor\plugin.py", line 2679, in current_file_changed
    cursor = self.get_current_editor().textCursor()
AttributeError: 'NoneType' object has no attribute 'textCursor'
Traceback (most recent call last):
  File "C:\Program Files\Spyder\pkgs\spyder\plugins\editor\plugin.py", line 2679, in current_file_changed
    cursor = self.get_current_editor().textCursor()
AttributeError: 'NoneType' object has no attribute 'textCursor'
Traceback (most recent call last):
  File "C:\Program Files\Spyder\pkgs\spyder\plugins\editor\plugin.py", line 2697, in current_editor_cursor_changed
    filename = code_editor.filename
AttributeError: 'NoneType' object has no attribute 'filename'
Traceback (most recent call last):
  File "C:\Program Files\Spyder\pkgs\spyder\plugins\editor\plugin.py", line 2679, in current_file_changed
    cursor = self.get_current_editor().textCursor()
AttributeError: 'NoneType' object has no attribute 'textCursor'
Traceback (most recent call last):
  File "C:\Program Files\Spyder\pkgs\spyder\plugins\editor\plugin.py", line 2679, in current_file_changed
    cursor = self.get_current_editor().textCursor()
AttributeError: 'NoneType' object has no attribute 'textCursor'
Traceback (most recent call last):
  File "C:\Program Files\Spyder\pkgs\spyder\plugins\editor\plugin.py", line 2697, in current_editor_cursor_changed
    filename = code_editor.filename
AttributeError: 'NoneType' object has no attribute 'filename'

Versions

• Spyder version: 5.4.2 (standalone)
• Python version: 3.8.10 64-bit
• Qt version: 5.15.2
• PyQt5 version: 5.15.7
• Operating System: Windows 10

Dependencies

# Mandatory:
atomicwrites >=1.2.0                 :  1.4.1 (OK)
chardet >=2.0.0                      :  5.1.0 (OK)
cloudpickle >=0.5.0                  :  2.2.0 (OK)
cookiecutter >=1.6.0                 :  2.1.1 (OK)
diff_match_patch >=20181111          :  20200713 (OK)
intervaltree                         :  None (OK)
IPython >=7.31.1;<9.0.0              :  8.8.0 (OK)
jedi >=0.17.2;<0.19.0                :  0.18.2 (OK)
jellyfish >=0.7                      :  0.9.0 (OK)
jsonschema >=3.2.0                   :  4.17.3 (OK)
keyring >=17.0.0                     :  23.13.1 (OK)
nbconvert >=4.0                      :  7.2.8 (OK)
numpydoc >=0.6.0                     :  1.5.0 (OK)
paramiko >=2.4.0                     :  2.12.0 (OK)
parso >=0.7.0;<0.9.0                 :  0.8.3 (OK)
pexpect >=4.4.0                      :  4.8.0 (OK)
pickleshare >=0.4                    :  0.7.5 (OK)
psutil >=5.3                         :  5.9.4 (OK)
pygments >=2.0                       :  2.14.0 (OK)
pylint >=2.5.0;<3.0                  :  2.15.10 (OK)
pylint_venv >=2.1.1                  :  2.3.0 (OK)
pyls_spyder >=0.4.0                  :  0.4.0 (OK)
pylsp >=1.7.1;<1.8.0                 :  1.7.1 (OK)
pylsp_black >=1.2.0                  :  1.2.1 (OK)
qdarkstyle >=3.0.2;<3.1.0            :  3.0.3 (OK)
qstylizer >=0.2.2                    :  0.2.2 (OK)
qtawesome >=1.2.1                    :  1.2.2 (OK)
qtconsole >=5.4.0;<5.5.0             :  5.4.0 (OK)
qtpy >=2.1.0                         :  2.3.0 (OK)
rtree >=0.9.7                        :  1.0.1 (OK)
setuptools >=49.6.0                  :  66.0.0 (OK)
sphinx >=0.6.6                       :  6.1.3 (OK)
spyder_kernels >=2.4.2;<2.5.0        :  2.4.2 (OK)
textdistance >=4.2.0                 :  4.5.0 (OK)
three_merge >=0.1.1                  :  0.1.1 (OK)
watchdog                             :  2.2.1 (OK)
zmq >=22.1.0                         :  24.0.1 (OK)

# Optional:
cython >=0.21                        :  0.29.33 (OK)
matplotlib >=3.0.0                   :  3.6.3 (OK)
numpy >=1.7                          :  1.24.1 (OK)
pandas >=1.1.1                       :  1.5.2 (OK)
scipy >=0.17.0                       :  1.10.0 (OK)
sympy >=0.7.3                        :  1.11.1 (OK)

# Spyder plugins:
spyder_terminal.terminalplugin 1.2.2 :  1.2.2 (OK)

[dalthviz]

Hi @VeloSteve thank you for the feedback! I was able to reproduce this! We will check a fix for it in a future release 👍