Error with Stems in directories with special symbols (Addendum to #13550)

[Eve00000]

Bug Description

I wanted to reorganize my library, put stems at the same place of the original.
Importing the stem is no problem, opening (analyzing or player) makes Mixxx crash.

Deduction of the problem learns:
F:\Music#0500 - Artists\Anne Clark\Anne Clark - Best Of Anne Clark (1992)\19 Anne Clark - Our Darkness (12_).stem.m4a
plays perfect, analazer, deck, sampler ...
F:\Music#0500 - Artists\Anne Clark •\Anne Clark - Best Of Anne Clark (1992)\19 Anne Clark - Our Darkness (12_).stem.m4a
makes Mixxx crash. Normal ALAC files in this directory play fine.

The difference betweeb the 2 locations is the " •" after the name in the artist directory (to mark a directory as a Artist Container).

I compaired
src\sources\soundsourceffmpeg.cpp
src\sources\soundsourceflac.cpp
src\sources\soundsourcemp3.cpp
src\sources\soundsourcestem.cpp
src\sources\soundsourceopus.cpp
src\sources\soundsourcewv.cpp
src\sources\soundsourcem4a.cpp
they all have a different way to translate the location,
I will highlight the windows lines

M4A:
m_hFile = MP4Read(getLocalFileName().toUtf8().constData(), 0);
Opus:
QByteArray qBAFilename = getLocalFileName().toUtf8();
...
in some cases the filename is converted to utf8 and const, on otherr formats it isn't.

I played around with converting the "getLocalFileName()" without success.
I think #13550 suffers of a similar problem.
As I can remember 2.3.4 (or 5) had the same problem with " •" and other symbols for all files but the next release solved that.
I tried to find the pr / solution but couldn't find it.

Version

2.5 & 2.6

OS

Win

[Eve00000]

Solved in PR #13784