Repository: spyder-ide/spyder

Issue:
TypeError when displaying indent guides in Python 3.10
## Description

### What steps will reproduce the problem?

<!--- You can use Markdown here --->

I just start spyder5 with python 3.10 on Manjaro. However spyder run after hide this errors during the session. 

### Traceback
```python-traceback
Traceback (most recent call last):
  File "/usr/lib/python3.10/site-packages/spyder/plugins/editor/panels/indentationguides.py", line 96, in paintEvent
    painter.drawLine(x, top, x, bottom)
TypeError: arguments did not match any overloaded call:
  drawLine(self, QLineF): argument 1 has unexpected type 'float'
  drawLine(self, QLine): argument 1 has unexpected type 'float'
  drawLine(self, int, int, int, int): argument 1 has unexpected type 'float'
  drawLine(self, QPoint, QPoint): argument 1 has unexpected type 'float'
  drawLine(self, Union[QPointF, QPoint], Union[QPointF, QPoint]): argument 1 has unexpected type 'float'
QBackingStore::endPaint() called with active painter; did you forget to destroy it or call QPainter::end() on it?
QBackingStore::endPaint() called with active painter; did you forget to destroy it or call QPainter::end() on it?
```

## Versions

* Spyder version: 5.2.0 
* Python version: 3.10.1
* Qt version: 5.15.2
* PyQt5 version: 5.15.6
* Operating System: Linux 5.4.169-1-MANJARO

### Dependencies

```

# Mandatory:
atomicwrites >=1.2.0          :  1.4.0 (OK)
chardet >=2.0.0               :  4.0.0 (OK)
cloudpickle >=0.5.0           :  2.0.0 (OK)
cookiecutter >=1.6.0          :  1.7.3 (OK)
diff_match_patch >=20181111   :  20200713 (OK)
intervaltree >=3.0.2          :  3.1.0 (OK)
IPython >=7.6.0               :  7.30.1 (OK)
jedi >=0.17.2;<0.19.0         :  0.18.1 (OK)
jellyfish >=0.7               :  0.8.9 (OK)
jsonschema >=3.2.0            :  3.2.0 (OK)
keyring >=17.0.0              :  23.4.0 (OK)
nbconvert >=4.0               :  6.1.0 (OK)
numpydoc >=0.6.0              :  1.1.0 (OK)
parso >=0.7.0;<0.9.0          :  0.8.2 (OK)
pexpect >=4.4.0               :  4.8.0 (OK)
pickleshare >=0.4             :  0.7.5 (OK)
psutil >=5.3                  :  5.8.0 (OK)
pygments >=2.0                :  2.10.0 (OK)
pylint >=2.5.0                :  2.12.2 (OK)
pyls_spyder >=0.4.0           :  0.4.0 (OK)
pylsp >=1.3.1;<1.4.0          :  1.3.2 (OK)
pylsp_black >=1.0.0           :  None (OK)
qdarkstyle >=3.0.2            :  3.0.2 (OK)
qstylizer >=0.1.10            :  0.2.1 (OK)
qtawesome >=1.0.2             :  1.0.3 (OK)
qtconsole >=5.2.1;<5.3.0      :  5.2.1 (OK)
qtpy >=1.5.0                  :  1.11.2 (OK)
rtree >=0.9.7                 :  0.9.7 (OK)
setuptools >=49.6.0           :  57.4.0 (OK)
sphinx >=0.6.6                :  4.3.2 (OK)
spyder_kernels >=2.2.0;<2.3.0 :  2.2.0 (OK)
textdistance >=4.2.0          :  4.2.2 (OK)
three_merge >=0.1.1           :  0.1.1 (OK)
watchdog >=0.10.3             :  0.10.7 (OK)
xdg >=0.26                    :  0.27 (OK)
zmq >=17                      :  22.2.1 (OK)

# Optional:
cython >=0.21                 :  0.29.26 (OK)
matplotlib >=2.0.0            :  3.5.1 (OK)
numpy >=1.7                   :  1.21.5 (OK)
pandas >=1.1.1                :  1.3.5 (OK)
scipy >=0.17.0                :  1.7.3 (OK)
sympy >=0.7.3                 :  1.9 (OK)
```



Discussion:
Hey @Ptiji, thanks for reporting. We'll fix this bug in our next version (5.2.2), to be released in a couple of weeks.

However, please use Python 3.9 for a much better experience (Spyder is not ready for Python 3.10 yet due to these small bugs).

Resolving patch:
diff --git a/spyder/plugins/editor/panels/indentationguides.py b/spyder/plugins/editor/panels/indentationguides.py
--- a/spyder/plugins/editor/panels/indentationguides.py
+++ b/spyder/plugins/editor/panels/indentationguides.py
@@ -91,8 +91,8 @@ def paintEvent(self, event):
 
                 if end_whitespace and end_whitespace != total_whitespace:
                     font_metrics = self.editor.fontMetrics()
-                    x = (font_metrics.width(total_whitespace * '9') +
-                         self.bar_offset + offset)
+                    x = int(font_metrics.width(total_whitespace * '9') +
+                            self.bar_offset + offset)
                     painter.drawLine(x, top, x, bottom)
 
     # --- Other methods


Test patch: