Cannot scroll to last epoch in `epochs.plot()`

[cbrnr]

When using the Matplotlib backend, epochs.plot() does not allow scrolling to the final epoch by clicking into the horizontal scrollbar (the right arrow key works correctly). This issue does not occur when using the Qt backend.

Here's a reproducible example:

from numpy.random import default_rng

import mne

mne.viz.set_browser_backend("matplotlib")

n_channels = 3
n_epochs = 25
duration = 2
sfreq = 250

rng = default_rng(42)
data = rng.standard_normal(size=(n_epochs, n_channels, duration * sfreq)) * 5e-6
info = mne.create_info(n_channels, sfreq, "eeg")
epochs = mne.EpochsArray(data, info)

epochs.plot(block=True)