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Fixes #7742 - axhline rescale issue #8210

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Fixes #7742 - axhline rescale issue #8210

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4 changes: 4 additions & 0 deletions lib/matplotlib/axes/_axes.py
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Original file line number Diff line number Diff line change
Expand Up @@ -724,8 +724,12 @@ def axhline(self, y=0, xmin=0, xmax=1, **kwargs):

trans = self.get_yaxis_transform(which='grid')
l = mlines.Line2D([xmin, xmax], [y, y], transform=trans, **kwargs)

# Save state for ignoring existing data limits and set it back later
ignore = self.ignore_existing_data_limits
self.add_line(l)
self.autoscale_view(scalex=False, scaley=scaley)
self.ignore_existing_data_limits = ignore
return l

@docstring.dedent_interpd
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29 changes: 29 additions & 0 deletions lib/matplotlib/tests/test_axes.py
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Expand Up @@ -4972,3 +4972,32 @@ def test_bar_single_height():
ax.bar(range(4), 1)
# Check that a horizontal chart with one width works
ax.bar(0, 1, bottom=range(4), width=1, orientation='horizontal')


def test_axhline_datetime_limits():
# Plot horizontal line with other lines in
# different order and check if they have the same limits
date1 = datetime.datetime(2016, 1, 1, 0, 0, 0)
date2 = datetime.datetime(2016, 1, 30, 0, 0, 0)
date3 = datetime.datetime(2016, 1, 10, 0, 0, 0)

dates1 = [date1, date2]
values1 = [1, 2]

dates2 = [date1, date3]
values2 = [0, 5]

fig, (ax1, ax2) = plt.subplots(2, 1)

ax1.axhline(1.5)
ax1.plot(dates1, values1)

ax2.plot(dates1, values1)
ax2.axhline(1.5)

assert ax1.get_xlim() == ax2.get_xlim()

ax1.plot(dates2, values2)
ax2.plot(dates2, values2)

assert ax1.get_xlim() == ax2.get_xlim()