Short description

When aspect ratio is set to locked, using mouse move with right-button pressed no longer zooms properly.
The PlotItem can only be zoomed-out but can no longer be zoomed-in.

Code to reproduce

import pyqtgraph as pg
import numpy as np

Z = np.linspace(0, 1, 12).reshape((3, 4))

pg.mkQApp()
win = pg.PlotWidget()
win.setAspectLocked(True)
pcmi = pg.PColorMeshItem(Z)
win.addItem(pcmi)
win.show()
pg.exec()

Additional context

Bisecting points to 55d90aa (2024/07/16) as the culprit (PR #3100).