pyqtgraph axis label gets covered for 2D plots

[sldesnoo-Delft]

This is a similar issue as #134.
When I use a pyqtgraph PlotItem to add an ImageView, then the x-axis label gets partially covered.

The fix is to add zero padding to QGraphicsView:

QGraphicsView {
    padding: 0px;
}

Environment:

* OPERATING SYSTEM---------------------------------------------------------------
    - System........................ Windows
    - Release....................... 10
    - Platform...................... Windows-10-10.0.19045-SP0
    - Version....................... 10.0.19045
* PYTHON DISTRIBUTION------------------------------------------------------------
    - Version....................... 3.12.7
    - C Compiler.................... MSC v.1929 64 bit (AMD64)
    - C API Version................. 1013
    - Implementation................ cpython
    - Implementation Version........ 3.12.7
* QT BINDINGS--------------------------------------------------------------------
    - PyQt5 Version................. 5.15.11
    - PyQt5 Qt Version.............. 5.15.2
* QT ABSTRACTIONS----------------------------------------------------------------
    - qtpy Version.................. 2.4.1
    - qtpy Binding.................. pyqt5
    - qtpy Binding Variable......... os.environ['QT_API']
    - qtpy Import Name.............. qtpy
    - qtpy Status................... OK
    - pyqtgraph Version............. 0.13.7.4
    - pyqtgraph Binding............. Not set or inexistent
    - pyqtgraph Binding Variable.... os.environ['PYQTGRAPH_QT_LIB']
    - pyqtgraph Import Name......... pyqtgraph
    - pyqtgraph Status.............. OK
* PYTHON PACKAGES----------------------------------------------------------------
    - helpdev....................... 0.7.1
    - QDarkStyle.................... 3.2.3

Code to reproduce:

import numpy as np
import pyqtgraph as pg
import qdarkstyle
from PyQt5 import QtWidgets

class Plotter(QtWidgets.QWidget):
    def __init__(self):
        super().__init__()

        self.setMinimumSize(600, 400)
        self._layout = QtWidgets.QVBoxLayout()
        self.setLayout(self._layout)

        self.plot = pg.PlotItem()
        img = pg.ImageItem()
        img.setImage(np.diag(np.ones(200)))
        self.img_view = pg.ImageView(view=self.plot, imageItem=img)
        self._layout.addWidget(self.img_view)
        self.plot.getAxis('bottom').setLabel("X-axis")

        self.show()

apply_fix = False

app = pg.mkQApp()

app = QtWidgets.QApplication.instance()

dark_stylesheet = qdarkstyle.load_stylesheet()

if apply_fix:
    dark_stylesheet +=r'''
    QGraphicsView {
        padding: 0px;
    }
    '''
app.setStyleSheet(dark_stylesheet)

plotter = Plotter()