Cast drawLine input arguments to int

[samiamlabs]

I was getting the following error and resulting crash when using rqt_graph on humble with python 3.10.

Traceback (most recent call last):
  File "/home/ros/install/qt_dotgraph/local/lib/python3.10/dist-packages/qt_dotgraph/dot_shapes.py", line 16, in paint
    rectangle = QRect(self._bounding_box.topLeft().x(),
TypeError: arguments did not match any overloaded call:
  QRect(): too many arguments
  QRect(int, int, int, int): argument 1 has unexpected type 'float'
  QRect(QPoint, QPoint): argument 1 has unexpected type 'float'
  QRect(QPoint, QSize): argument 1 has unexpected type 'float'
  QRect(QRect): argument 1 has unexpected type 'float'
Aborted (core dumped)

Explicitly casting the inputs to int seems to resolve this issue.

[ivanpauno]

Fix LGTM.
I have a minor comment about style.
Thanks for the contribution!!

[clalancette]

I made the requested fixes on this PR, and this fixes the issue for me. I'm going to go ahead and run CI on this, and also port it over to the 'rolling' branch.

[clalancette]

CI:

• Linux
• Linux-aarch64
• Windows

[clalancette]

The warning has nothing to do with this PR (though I'm not honestly sure why we see it in CI and not on the nightlies). Regardless, I'm going to go ahead and merge this one in.

[clalancette]

@Mergifyio backport rolling

[mergify]

backport rolling

✅ Backports have been created

• #265 Cast drawLine input arguments to int (backport #264) has been created for branch rolling