Instaloader: Crash when downloading a Highlight

[i-cant-git]

Instaloader crashes when I try to download a Highlight with ".." in its name.

🔥🔥🔥 I tested this with multiple accounts, I get the same error. 🔥🔥🔥

Steps to reproduce the behavior:
Any account with a highlight that has ".." in its name

Error messages and tracebacks

$ instaloader username --no-posts --highlights
.
Retrieving highlights "Cats.." from profile username
[  1/  4] username/Cats../2019-02-13_10-23-25_UTC.jpg Traceback (most recent call last):
  File "C:\python3\python-3.6.1.amd64\lib\runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "C:\python3\python-3.6.1.amd64\lib\runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "C:\python3\python-3.6.1.amd64\Scripts\instaloader.exe\__main__.py", line 9, in <module>
  File "C:\python3\python-3.6.1.amd64\lib\site-packages\instaloader\__main__.py", line 410, in main
    storyitem_filter_str=args.storyitem_filter)
  File "C:\python3\python-3.6.1.amd64\lib\site-packages\instaloader\__main__.py", line 186, in _main
    download_stories, fast_update, post_filter, storyitem_filter)
  File "C:\python3\python-3.6.1.amd64\lib\site-packages\instaloader\instaloader.py", line 961, in download_profiles
    self.download_highlights(profile, fast_update=fast_update, storyitem_filter=storyitem_filter)
  File "C:\python3\python-3.6.1.amd64\lib\site-packages\instaloader\instaloader.py", line 47, in call
    return func(instaloader, *args, **kwargs)
  File "C:\python3\python-3.6.1.amd64\lib\site-packages\instaloader\instaloader.py", line 620, in download_highlights
    else '{}/{}'.format(name, user_highlight.title))
  File "C:\python3\python-3.6.1.amd64\lib\site-packages\instaloader\instaloader.py", line 555, in download_storyitem
    downloaded = self.download_pic(filename=filename, url=url, mtime=date_local)
  File "C:\python3\python-3.6.1.amd64\lib\site-packages\instaloader\instaloader.py", line 65, in call
    return func(instaloader, *args, **kwargs)
  File "C:\python3\python-3.6.1.amd64\lib\site-packages\instaloader\instaloader.py", line 227, in download_pic
    self.context.get_and_write_raw(url, filename)
  File "C:\python3\python-3.6.1.amd64\lib\site-packages\instaloader\instaloadercontext.py", line 523, in get_and_write_raw
    self.write_raw(self.get_raw(url), filename)
  File "C:\python3\python-3.6.1.amd64\lib\site-packages\instaloader\instaloadercontext.py", line 489, in write_raw
    with open(filename, 'wb') as file:
FileNotFoundError: [Errno 2] No such file or directory: 'username/Cats../2019-02-13_10-23-25_UTC.jpg'

Instaloader version

$ instaloader --version
4.2.3

Edit:
Windows automatically removes final ".." when creating a folder, then it crashes when it tries to access folder "Cats" without ".." in it.

[ghost]

I can confirm that the problem is because there's a highlight with ".. " in it. I tried creating a highlight with ".." as its name, and the script would crash.
Here's one of my recent crashes with the following user "mayatoister" , I hope you solve the problem , because its really annoying
Crash log.txt
adi.txt

[aandergr]

Similar to #185, in that it also refers to windows filename restrictions.

[github-actions[bot]]

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