Issue 1:
Bug report

Bug summary

Using tex (rcParams["text.usetex"] = True) results in an error because of a font name not being valid in current master. Works fine with matplotlib 2.2.3.

Code for reproduction

import matplotlib.pyplot as plt
plt.rcParams["text.usetex"] = True

plt.plot([1,2,3])
plt.show()

Actual outcome

File "d:\***\matplotlib\lib\matplotlib\dviread.py", line 736, in __init__
with open(filename, 'rb') as file:
OSError: [Errno 22] Invalid argument: 'D:/Programme/Office/MiKTeX/fonts/tfm/public/cm/cmr10.tfm\r'

I would suspect the \r simply does not belong at the end of the string.

Complete Traceback

Traceback (most recent call last):
File "d:\***\matplotlib\lib\matplotlib\backends\backend_qt5.py", line 519, in _draw_idle
self.draw()
File "d:\***\matplotlib\lib\matplotlib\backends\backend_agg.py", line 399, in draw
self.figure.draw(self.renderer)
File "d:\***\matplotlib\lib\matplotlib\artist.py", line 34, in draw_wrapper
return draw(artist, renderer, *args, **kwargs)
File "d:\***\matplotlib\lib\matplotlib\figure.py", line 1649, in draw
renderer, self, artists, self.suppressComposite)
File "d:\***\matplotlib\lib\matplotlib\image.py", line 137, in _draw_list_compositing_images
a.draw(renderer)
File "d:\***\matplotlib\lib\matplotlib\artist.py", line 34, in draw_wrapper
return draw(artist, renderer, *args, **kwargs)
File "d:\***\matplotlib\lib\matplotlib\axes\_base.py", line 2623, in draw
mimage._draw_list_compositing_images(renderer, self, artists)
File "d:\***\matplotlib\lib\matplotlib\image.py", line 137, in _draw_list_compositing_images
a.draw(renderer)
File "d:\***\matplotlib\lib\matplotlib\artist.py", line 34, in draw_wrapper
return draw(artist, renderer, *args, **kwargs)
File "d:\***\matplotlib\lib\matplotlib\axis.py", line 1186, in draw
renderer)
File "d:\***\matplotlib\lib\matplotlib\axis.py", line 1124, in _get_tick_bboxes
extent = tick.label1.get_window_extent(renderer)
File "d:\***\matplotlib\lib\matplotlib\text.py", line 902, in get_window_extent
bbox, info, descent = self._get_layout(self._renderer)
File "d:\***\matplotlib\lib\matplotlib\text.py", line 312, in _get_layout
ismath=ismath)
File "d:\***\matplotlib\lib\matplotlib\backends\backend_agg.py", line 206, in get_text_width_height_descent
s, fontsize, renderer=self)
File "d:\***\matplotlib\lib\matplotlib\texmanager.py", line 466, in get_text_width_height_descent
page = next(iter(dvi))
File "d:\***\matplotlib\lib\matplotlib\dviread.py", line 244, in __iter__
while self._read():
File "d:\***\matplotlib\lib\matplotlib\dviread.py", line 302, in _read
self._dtable[byte](self, byte)
File "d:\***\matplotlib\lib\matplotlib\dviread.py", line 162, in wrapper
return method(self, *[f(self, byte-min) for f in get_args])
File "d:\***\matplotlib\lib\matplotlib\dviread.py", line 442, in _fnt_def
self._fnt_def_real(k, c, s, d, a, l)
File "d:\***\matplotlib\lib\matplotlib\dviread.py", line 447, in _fnt_def_real
tfm = _tfmfile(fontname)
File "d:\***\matplotlib\lib\matplotlib\dviread.py", line 1035, in _fontfile
return cls(filename) if filename else None
File "d:\***\matplotlib\lib\matplotlib\dviread.py", line 736, in __init__
with open(filename, 'rb') as file:
OSError: [Errno 22] Invalid argument: 'D:/Programme/Office/MiKTeX/fonts/tfm/public/cm/cmr10.tfm\r'

Expected outcome

No Error.

Matplotlib version

Operating system: Windows 8.1

Matplotlib version: master

Matplotlib backend (print(matplotlib.get_backend())): Qt5Agg

Python version: 3.6

Issue 2:
Bug report

I like to test my code against the bleeding edge version of matplotlib (by installing it in a conda virtual environment) on my work machine (Windows PC). Since I do not have admin rights to install the necessary tools to build from source, I download the wheels from appveyor and use pip install.

The following code snippet (representing a part of my working code) started giving an error after I installed "matplotlib-3.0.0rc1+424.g19420b97.dirty-cp36-cp36m-win_amd64.whl" (which corresponds to Merge pull request #12253 from anntzer/kpathsea-encoding FIX: Handle utf-8 output by kpathsea on Windows). The wheel which was built for the commit before that, matplotlib-3.0.0rc1+420.gb2c89917.dirty-cp36-cp36m-win_amd64.whl works fine (I reinstalled it and the code snippet works).

I am not sure if this is the right way to test the bleeding edge code (when you do not have admin rights to install the tools necessary to build from source). If the procedure I am following is not correct, please feel free to close the issue.

Code for reproduction

import matplotlib.pyplot as plt
import numpy as np
from matplotlib import rc
rc('text', usetex=True)
rc('text.latex', preamble=r'\usepackage{fourier}, \usepackage[T1]{fontenc}')
fig, ax = plt.subplots()
ax.plot(np.arange(10))
fig.savefig('test.pdf')

Actual outcome

OSError: [Errno 22] Invalid argument: 'C:/Program Files/MiKTeX 2.9/fonts/tfm/jknappen/ec/ecss1000.tfm
\r'

Expected outcome

Matplotlib version

Operating system: Windows 10

Matplotlib version: 3.0.0rc1+424.g19420b97.dirty

Matplotlib backend (print(matplotlib.get_backend())): Qt5Agg

Python version:

Jupyter version (if applicable):

Other libraries: