DateAxisItem renders correctly only for one plot if re-added

[stan-servaenergy]

Short description

In my app I'd like to able to switch X-axis labels between DateAxisItem and my custom AxisItem. While implementing this, I've noticed that adding DateAxisItem to multiple plots seem to be broken, or at least not working as expected.

Code to reproduce

import pyqtgraph as pg
from PySide6.QtCore import QTimer

cnt = 0


def timer_callback1():
    global cnt
    for pl in plots:
        match cnt % 2:
            case 0:
                pl.setAxisItems({"bottom": pg.DateAxisItem()})
            case 1:
                pl.setAxisItems({"bottom": pg.AxisItem("bottom")})
    cnt += 1


app = pg.mkQApp()

plots = []
win = pg.GraphicsLayoutWidget()

for i in range(2):
    plots.append(win.addPlot(title=f"Plot {i+1}"))
    win.nextRow()

t = QTimer()
t.setInterval(1000)
t.timeout.connect(timer_callback1)
t.start()


win.show()
app.exec()

Expected behavior

The timer toggles between DateAxisItem and AxisItem, both plots always have same labels.

Real behavior

Only first plot is showing correct tick labels when using DateAxisItem. Both plots showing correct tick labels with AxisItem.

Tested environment(s)

• PyQtGraph version: 0.13.4
• Qt Python binding: PySide6 6.6.2 Qt 6.6.2
• Python version: Python 3.11.6
• NumPy version: 1.26.4
• Operating system: Ubuntu 23.10
• Installation method: pip/venv

[stan-servaenergy]

My analysis seems to point to generateDrawSpecs, which is for some reason producing incorrect width (too small) for the axis (for the second plot), which then causes rest of the pipeline to produce no tick labels.