Repository: spyder-ide/spyder

Issue:
Editor error while closing a project
## Description

### What steps will reproduce the problem?

<!--- You can use Markdown here --->

1. Close a project that has been open for a while (at least a couple of hours).

Not sure if that would be enough to trigger the error :thinking:

Also, seems like it has been reported before: #15722 and https://github.com/spyder-ide/spyder/issues/15668#issuecomment-846239769 

### Traceback
```python-traceback
Traceback (most recent call last):
  File "C:\Program Files\Spyder\pkgs\spyder\plugins\editor\panels\debugger.py", line 89, in paintEvent
    painter.fillRect(event.rect(), self.editor.sideareas_color)
TypeError: arguments did not match any overloaded call:
  fillRect(self, a0: QRectF, a1: Union[QBrush, QColor, Qt.GlobalColor, QGradient]): argument 1 has unexpected type 'QRect'
  fillRect(self, a0: QRect, a1: Union[QBrush, QColor, Qt.GlobalColor, QGradient]): argument 2 has unexpected type 'NoneType'
  fillRect(self, x: int, y: int, w: int, h: int, b: Union[QBrush, QColor, Qt.GlobalColor, QGradient]): argument 1 has unexpected type 'QRect'
  fillRect(self, a0: QRectF, color: Union[QColor, Qt.GlobalColor, QGradient]): argument 1 has unexpected type 'QRect'
  fillRect(self, a0: QRect, color: Union[QColor, Qt.GlobalColor, QGradient]): argument 2 has unexpected type 'NoneType'
  fillRect(self, x: int, y: int, w: int, h: int, b: Union[QColor, Qt.GlobalColor, QGradient]): argument 1 has unexpected type 'QRect'
  fillRect(self, x: int, y: int, w: int, h: int, c: Qt.GlobalColor): argument 1 has unexpected type 'QRect'
  fillRect(self, r: QRect, c: Qt.GlobalColor): argument 2 has unexpected type 'NoneType'
  fillRect(self, r: QRectF, c: Qt.GlobalColor): argument 1 has unexpected type 'QRect'
  fillRect(self, x: int, y: int, w: int, h: int, style: Qt.BrushStyle): argument 1 has unexpected type 'QRect'
  fillRect(self, r: QRect, style: Qt.BrushStyle): argument 2 has unexpected type 'NoneType'
  fillRect(self, r: QRectF, style: Qt.BrushStyle): argument 1 has unexpected type 'QRect'
  fillRect(self, x: int, y: int, w: int, h: int, preset: QGradient.Preset): argument 1 has unexpected type 'QRect'
  fillRect(self, r: QRect, preset: QGradient.Preset): argument 2 has unexpected type 'NoneType'
  fillRect(self, r: QRectF, preset: QGradient.Preset): argument 1 has unexpected type 'QRect'
Traceback (most recent call last):
  File "C:\Program Files\Spyder\pkgs\spyder\plugins\editor\panels\linenumber.py", line 75, in paintEvent
    painter.fillRect(event.rect(), self.editor.sideareas_color)
TypeError: arguments did not match any overloaded call:
  fillRect(self, a0: QRectF, a1: Union[QBrush, QColor, Qt.GlobalColor, QGradient]): argument 1 has unexpected type 'QRect'
  fillRect(self, a0: QRect, a1: Union[QBrush, QColor, Qt.GlobalColor, QGradient]): argument 2 has unexpected type 'NoneType'
  fillRect(self, x: int, y: int, w: int, h: int, b: Union[QBrush, QColor, Qt.GlobalColor, QGradient]): argument 1 has unexpected type 'QRect'
  fillRect(self, a0: QRectF, color: Union[QColor, Qt.GlobalColor, QGradient]): argument 1 has unexpected type 'QRect'
  fillRect(self, a0: QRect, color: Union[QColor, Qt.GlobalColor, QGradient]): argument 2 has unexpected type 'NoneType'
  fillRect(self, x: int, y: int, w: int, h: int, b: Union[QColor, Qt.GlobalColor, QGradient]): argument 1 has unexpected type 'QRect'
  fillRect(self, x: int, y: int, w: int, h: int, c: Qt.GlobalColor): argument 1 has unexpected type 'QRect'
  fillRect(self, r: QRect, c: Qt.GlobalColor): argument 2 has unexpected type 'NoneType'
  fillRect(self, r: QRectF, c: Qt.GlobalColor): argument 1 has unexpected type 'QRect'
  fillRect(self, x: int, y: int, w: int, h: int, style: Qt.BrushStyle): argument 1 has unexpected type 'QRect'
  fillRect(self, r: QRect, style: Qt.BrushStyle): argument 2 has unexpected type 'NoneType'
  fillRect(self, r: QRectF, style: Qt.BrushStyle): argument 1 has unexpected type 'QRect'
  fillRect(self, x: int, y: int, w: int, h: int, preset: QGradient.Preset): argument 1 has unexpected type 'QRect'
  fillRect(self, r: QRect, preset: QGradient.Preset): argument 2 has unexpected type 'NoneType'
  fillRect(self, r: QRectF, preset: QGradient.Preset): argument 1 has unexpected type 'QRect'
Traceback (most recent call last):
  File "C:\Program Files\Spyder\pkgs\spyder\plugins\editor\panels\scrollflag.py", line 190, in paintEvent
    painter.fillRect(event.rect(), self.editor.sideareas_color)
TypeError: arguments did not match any overloaded call:
  fillRect(self, a0: QRectF, a1: Union[QBrush, QColor, Qt.GlobalColor, QGradient]): argument 1 has unexpected type 'QRect'
  fillRect(self, a0: QRect, a1: Union[QBrush, QColor, Qt.GlobalColor, QGradient]): argument 2 has unexpected type 'NoneType'
  fillRect(self, x: int, y: int, w: int, h: int, b: Union[QBrush, QColor, Qt.GlobalColor, QGradient]): argument 1 has unexpected type 'QRect'
  fillRect(self, a0: QRectF, color: Union[QColor, Qt.GlobalColor, QGradient]): argument 1 has unexpected type 'QRect'
  fillRect(self, a0: QRect, color: Union[QColor, Qt.GlobalColor, QGradient]): argument 2 has unexpected type 'NoneType'
  fillRect(self, x: int, y: int, w: int, h: int, b: Union[QColor, Qt.GlobalColor, QGradient]): argument 1 has unexpected type 'QRect'
  fillRect(self, x: int, y: int, w: int, h: int, c: Qt.GlobalColor): argument 1 has unexpected type 'QRect'
  fillRect(self, r: QRect, c: Qt.GlobalColor): argument 2 has unexpected type 'NoneType'
  fillRect(self, r: QRectF, c: Qt.GlobalColor): argument 1 has unexpected type 'QRect'
  fillRect(self, x: int, y: int, w: int, h: int, style: Qt.BrushStyle): argument 1 has unexpected type 'QRect'
  fillRect(self, r: QRect, style: Qt.BrushStyle): argument 2 has unexpected type 'NoneType'
  fillRect(self, r: QRectF, style: Qt.BrushStyle): argument 1 has unexpected type 'QRect'
  fillRect(self, x: int, y: int, w: int, h: int, preset: QGradient.Preset): argument 1 has unexpected type 'QRect'
  fillRect(self, r: QRect, preset: QGradient.Preset): argument 2 has unexpected type 'NoneType'
  fillRect(self, r: QRectF, preset: QGradient.Preset): argument 1 has unexpected type 'QRect'
```

## Versions

* Spyder version: 5.4.5  (standalone)
* Python version: 3.8.10 64-bit
* Qt version: 5.15.2
* PyQt5 version: 5.15.9
* Operating System: Windows-10-10.0.19045-SP0

### Dependencies

```
# Mandatory:
atomicwrites >=1.2.0                                                        :  1.4.1 (OK)
chardet >=2.0.0                                                             :  5.2.0 (OK)
cloudpickle >=0.5.0                                                         :  2.2.1 (OK)
cookiecutter >=1.6.0                                                        :  2.3.0 (OK)
diff_match_patch >=20181111                                                 :  20230430 (OK)
intervaltree                                                                :  None (OK)
IPython >=7.31.1,<9.0.0,!=8.8.0,!=8.9.0,!=8.10.0,!=8.11.0,!=8.12.0,!=8.12.1 :  8.12.2 (OK)
jedi >=0.17.2,<0.19.0                                                       :  0.18.2 (OK)
jellyfish >=0.7                                                             :  1.0.0 (OK)
jsonschema >=3.2.0                                                          :  4.19.0 (OK)
keyring >=17.0.0                                                            :  24.2.0 (OK)
nbconvert >=4.0                                                             :  7.8.0 (OK)
numpydoc >=0.6.0                                                            :  1.5.0 (OK)
paramiko >=2.4.0                                                            :  3.3.1 (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                                                                :  5.9.5 (OK)
pygments >=2.0                                                              :  2.16.1 (OK)
pylint >=2.5.0,<3.0                                                         :  2.17.5 (OK)
pylint_venv >=3.0.2                                                         :  3.0.2 (OK)
pyls_spyder >=0.4.0                                                         :  0.4.0 (OK)
pylsp >=1.7.4,<1.8.0                                                        :  1.7.4 (OK)
pylsp_black >=1.2.0,<3.0.0                                                  :  1.3.0 (OK)
qdarkstyle >=3.0.2,<3.2.0                                                   :  3.1 (OK)
qstylizer >=0.2.2                                                           :  0.2.2 (OK)
qtawesome >=1.2.1                                                           :  1.2.3 (OK)
qtconsole >=5.4.2,<5.5.0                                                    :  5.4.3 (OK)
qtpy >=2.1.0                                                                :  2.4.0 (OK)
rtree >=0.9.7                                                               :  1.0.1 (OK)
setuptools >=49.6.0                                                         :  68.1.2 (OK)
sphinx >=0.6.6                                                              :  7.1.2 (OK)
spyder_kernels >=2.4.4,<2.5.0                                               :  2.4.4 (OK)
textdistance >=4.2.0                                                        :  4.5.0 (OK)
three_merge >=0.1.1                                                         :  0.1.1 (OK)
watchdog                                                                    :  3.0.0 (OK)
zmq >=22.1.0                                                                :  25.1.1 (OK)

# Optional:
cython >=0.21                                                               :  3.0.2 (OK)
matplotlib >=3.0.0                                                          :  3.7.2 (OK)
numpy >=1.7                                                                 :  1.24.4 (OK)
pandas >=1.1.1                                                              :  2.0.3 (OK)
scipy >=0.17.0                                                              :  1.10.1 (OK)
sympy >=0.7.3                                                               :  1.12 (OK)

# Spyder plugins:
spyder_terminal.terminalplugin 1.2.2                                        :  1.2.2 (OK)
```



Discussion:
The problem with this one is that it seems hard to reproduce. Any ideas on how to fix it?
Seems like `self.editor.sideareas_color` is `None` for the error to happen so maybe a validation could help? Although, it could be nice to understand why `self.editor.sideareas_color` is getting a `None` value 🤔 
> Seems like self.editor.sideareas_color is None for the error to happen

Yeah, it seems that's exactly the problem! I couldn't tell that from the traceback.

> so maybe a validation could help?

Agreed. Please do that for alpha3. Then you'll be to test the fix on your end and see if it really helps.

>  Although, it could be nice to understand why self.editor.sideareas_color is getting a None value 🤔

Agreed too, but if things work as expected after adding the validation you mentioned, then at least we'll no longer have to deal with this bug.
@dalthviz, could you address this one for alpha5? It seems relatively simple to fix.

Resolving patch:
diff --git a/spyder/plugins/debugger/panels/debuggerpanel.py b/spyder/plugins/debugger/panels/debuggerpanel.py
--- a/spyder/plugins/debugger/panels/debuggerpanel.py
+++ b/spyder/plugins/debugger/panels/debuggerpanel.py
@@ -89,7 +89,8 @@ def paintEvent(self, event):
         """
         super(DebuggerPanel, self).paintEvent(event)
         painter = QPainter(self)
-        painter.fillRect(event.rect(), self.editor.sideareas_color)
+        if self.editor.sideareas_color:
+            painter.fillRect(event.rect(), self.editor.sideareas_color)
         self.paint_cell(painter)
 
         for top, line_number, block in self.editor.visible_blocks:


Test patch: