Repository: youtube-dl
Issue: Recognize combining accents in sanitize_filename()
Labels: request

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---
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### If the purpose of this _issue_ is a _bug report_, _site support request_ or you are not completely sure provide the full verbose output as follows:

Add `-v` flag to **your command line** you run youtube-dl with, copy the **whole** output and insert it here. It should look similar to one below (replace it with **your** log inserted between triple ```):

```
$ youtube-dl -v <your command line>
[debug] System config: []
[debug] User config: []
[debug] Command-line args: [u'-v', u'http://www.youtube.com/watch?v=BaW_jenozKcj']
[debug] Encodings: locale cp1251, fs mbcs, out cp866, pref cp1251
[debug] youtube-dl version 2016.06.27
[debug] Python version 2.7.11 - Windows-2003Server-5.2.3790-SP2
[debug] exe versions: ffmpeg N-75573-g1d0487f, ffprobe N-75573-g1d0487f, rtmpdump 2.4
[debug] Proxy map: {}
...
<end of log>
```

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### If the purpose of this _issue_ is a _site support request_ please provide all kinds of example URLs support for which should be included (replace following example URLs by **yours**):
- Single video: https://www.youtube.com/watch?v=BaW_jenozKc
- Single video: https://youtu.be/BaW_jenozKc
- Playlist: https://www.youtube.com/playlist?list=PL4lCao7KL_QFVb7Iudeipvc2BCavECqzc

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Hi,

There are extra underscores in the filename in restrict mode when there should not be :

```
$ youtube-dl --version
2016.06.27
$ youtube-dl -f 18 --get-filename --restrict-filename hYDQZleciXE
Joseph_Prince_-_La_Gra_ce_est_Supe_rieure_a_La_Loi_-_FR__18__hYDQZleciXE.mp4
```

The command line `youtube-dl -f 18 --get-filename --restrict-filename hYDQZleciXE` should return:

`Joseph_Prince_-_La_Grace_est_Superieure_a_La_Loi_-_FR__18__hYDQZleciXE.mp4`

Can you have a look ?