Missing spaces between lines and y-axis

[arthurire]

Code Sample, a copy-pastable example if possible

import pandas as pd
import matplotlib.pyplot as plt
plt.plot([1,2],[2,4])
pd.DataFrame([2,4],index=[1,2]).plot()

Problem description

Plots generated by df.plot() and plt.plot() are different and I expected them exactly the same.

As you can see, all the spaces between y-axis and lines are missing when I use pd.DataFrame.plot().

When you have a large dataset and there's a rapid change at the end, the change might be covered by the border, makes the plot hard to read.

pandas version:0.25.0
matplotlib version:3.1.1

Latest version that works:
pandas:0.23.x
matplotlib 3.0.3

Expected Output

Two figures should look exactly the same.

Output of pd.show_versions()

INSTALLED VERSIONS

commit : None
python : 3.7.4.final.0
python-bits : 64
OS : Darwin
OS-release : 18.6.0
machine : x86_64
processor : i386
byteorder : little
LC_ALL : None
LANG : zh_CN.UTF-8
LOCALE : zh_CN.UTF-8

pandas : 0.25.0
numpy : 1.17.0
pytz : 2019.2
dateutil : 2.8.0
pip : 19.2.1
setuptools : 41.0.1
Cython : None
pytest : None
hypothesis : None
sphinx : None
blosc : None
feather : None
xlsxwriter : None
lxml.etree : None
html5lib : None
pymysql : None
psycopg2 : None
jinja2 : 2.10.1
IPython : 7.7.0
pandas_datareader: None
bs4 : None
bottleneck : None
fastparquet : None
gcsfs : None
lxml.etree : None
matplotlib : 3.1.1
numexpr : None
odfpy : None
openpyxl : None
pandas_gbq : None
pyarrow : None
pytables : None
s3fs : None
scipy : None
sqlalchemy : None
tables : None
xarray : None
xlrd : None
xlwt : None
xlsxwriter : None

[TomAugspurger]

Duplicate of #27686