[Bug]: LaTeX X-Tick Labels are Vertically Misaligned When DPI is Set #31802

import sys

import matplotlib
import matplotlib.pyplot as plt

print(matplotlib.__version__)
print(matplotlib.get_backend())
print(sys.version)

idxs = list(range(3))
labels = ["$w^{(2)}_1$", "$w^{(2)}_2$", "$b^{(2)}$"]

fig, ax = plt.subplots(figsize=(3, 3))
ax.set_xlim(-0.5, 2.5)
ax.set_ylim(-3, 3)
ax.set_xticks(idxs, labels)
ax.set_yticks([])
ax.tick_params(which="both", length=0)
fig.tight_layout()
fig.savefig("test.png", dpi=300)

import sys

import matplotlib
import matplotlib.pyplot as plt
from matplotlib.artist import Artist
from matplotlib.figure import Figure

print(matplotlib.__version__)
print(matplotlib.get_backend())
print(sys.version)


def get_center(fig: Figure, artist: Artist) -> tuple[float, float]:
    renderer = fig.canvas.get_renderer()  # type: ignore  # get_renderer() not in base class
    bbox = artist.get_window_extent(renderer)
    fig_box = bbox.transformed(fig.transFigure.inverted())
    x = (fig_box.xmin + fig_box.xmax) / 2
    y = (fig_box.ymin + fig_box.ymax) / 2
    return x, y


idxs = list(range(3))
labels = ["$w^{(2)}_1$", "$w^{(2)}_2$", "$b^{(2)}_1$"]  # add subscript to b2

fig, ax = plt.subplots(figsize=(3, 3))
ax.set_xlim(-0.5, 2.5)
ax.set_ylim(-3, 3)
ax.set_xticks(idxs, labels)
ax.set_yticks([])
ax.tick_params(which="both", length=0)
fig.tight_layout()  # call the layout function before fixing the label

orig_b2_label = ax.get_xticklabels()[-1]
orig_b2_x, orig_b2_y = get_center(fig, orig_b2_label)  # measure while it's still visible
orig_b2_label.set_visible(False)
b2_label = fig.text(
    orig_b2_x, orig_b2_y, "$b^{(2)}$", ha="center", va="center", transform=fig.transFigure
)
b2_label.set_in_layout(False)

fig.savefig("test-workaround.png", dpi=300)