User fonts not visible to MuseScore 3 (Windows 10)

Sorry, I wasn't talking about the fonts installed by MuseScore. MuseScore 3 was installed on the same system as MuseScore 2. Does this cause problems?
I now have both versions installed on a Mac as well. There are fewer fonts installed on this machine, all of which ( spot check ) are available under MuseScore 3. So it seems to be rather a Windows specific problem.
The question now is, which developer voluntarily installs countless fonts to check this?

@Jojo-Schmitz
I wanted to use a font called "Bodoni BT", which came with an really old version of Corel Draw. But there are so many other installed fonts not available, for example the Ubuntu font family (https://fonts.google.com/?query=ubuntu), to name a font that is slightly newer, which can be freely downloaded for test purposes.

@Marc Sabatella: above is a link to the also missing Ubuntu fonts.... ok, here it is again: https://fonts.google.com/?query=ubuntu

@Jojo-Schmitz: same computer, yes. Bodoni MT is installed as well on my system, but not available in MuseScore 3. My operating system is Windows 10 (1809).
Maybe there are too many fonts installed (I'm a fontoholic), but they are accessible in MuseScore 2, so this can not be the reason.

Just tested: additionally I still have a MuseScore 3 Alpha version on my computer. In this version the "lost" fonts are visible. If one selects e.g. Bodoni BT in the font menu below, then the font changes, but is immediately reset as soon as the text is no longer marked.
It is the following Alpha version:
OS: Windows 10 (10.0), Arch.: x86_64, MuseScore version (64-bit): 3.0.0, revision: 3abd82b

I was almost afraid of that. The only question is, why does it work with MuseScore 2, but not with 3? In addition, the fonts are also displayed in the alpha (see above).
After reinstalling Windows, I simply copied the fonts into the corresponding directory (c:\windows\fonts). I didn't use the Google specific installation (Skyfonts?).
I will try MuseScore 3 Beta on another computer with Windows 10 and gradually increase the number of fonts installed there.

I have now researched again, using a new installation of Windows 10 (1809), on which only the system fonts, fonts of some programs and those fonts that I often use in MuseScore were installed.
The fonts I installed were installed using the Fonts option in the Control Panel (drag and drop). These fonts were again not visible in MuseScore 3. Worse still, they weren't visible in Scribus 1.5.4, Inkscape 0.92.3 or Gimp 2.8.22, but in MuseScore 2 and LibreOffice 6 (of course also under Windows 10's Fonts dialogue). Then I copied these fonts with a file manager (Free Commander) directly into the Windows’ font directory (C:\Windows\Fonts). Strangely enough, there was no indication whether the fonts should really be overwritten, i.e. they were not yet in this directory. After this action they were suddenly available again in Scribus, Inkscape etc., but still not in MuseScore 3.
In the Control Panel, I selected one of these recalcitrant fonts and checked its properties to see if this font is actually stored under "C:\Windows\Fonts". It wasn't there! It was in "C:\Users[Username]\AppData\Local\Microsoft\Windows\Fonts". This is probably where all user-specific fonts end up. By right clicking I selected a font and selected "install for all users" and voilà, they were now also usable in MuseScore 3. Of course, I now have to install many more fonts in this way to test if the amount of fonts installed also plays a role. By the way, some fonts can also be obtained from the Microsoft Store. These again end up somewhere else, but were available in MuseScore 3. It makes sense to also display user specific fonts, which is really a bug in MuseScore 3, because in other open source programs (Inkscape, Scribus, Gimp...) it works. LibreOffice 6 + MuseScore 2 had the least problems, there the installation method didn't matter.

P.S. MuseScore 3 as a gift just in time for Christmas was a nice idea, but I would have wished for a longer beta phase. The final polish is missing. And the menu icons are worse than those of version 2 (to say it again (won't stop)). An appealing appearance also plays a role in whether you like to use software - OK, I still like it, thanks for all the work! - but with the program icon and the splash screen, you finally put more effort into it! Well, I'll stop here... there would be even more. I'll report more bugs at the right place, if that hasn't happened yet. Happy new year to all of you!

In any case, "font installation for non-admin users" is something that Microsoft introduced with Windows 10 1809 (October update). I was really surprised that there is now an extra folder for user fonts and that installing them in the proven way by drag and drop or copy didn't work for all applications anymore, which is why I googled again after possible changes in the last release of Windows 10:
https://blogs.windows.com/windowsexperience/2018/06/27/announcing-windo…

It doesn't work for me either (Windows 10, 1809). Some fonts might cause problems. In the German forum there was the problem with the font Nyala.ttf and this font was even part of the pre-installed fonts of Windows 7 and 8.
Maybe it has something to do with how a font was created. If you open your font (Lemon Milk, which somehow reminds me of the font of the Nivea brand) with a double-click, it says that it is of the type PostScript contours. Of course this doesn't help. If the font is very important, it helps to use only MuseScore 2 at the moment.

@Developers: perhaps it can also be solved by using a different font engine, as suggested in this post:

https://bugreports.qt.io/projects/QTBUG/issues/QTBUG-73241?filter=allis…

By the way, it is about Qt 5.12.3, i.e. the problem still exists there.

Hi, the option to install one font for all users is brand new in Window 10 in version 1809, which was the last major official update of Windows 10 last October. Unfortunately, it's no longer enough to just talk about Windows 10, the version used is just as important (the version can be found under Settings, then System and there under Info). There are also fonts that cannot be used with the option "Install for all users". Among them are also fonts that worked under MuseScore 2.
Which font doesn't work for you? If it is a font that can be downloaded for free, then I'll try it out. Sometimes you only see white boxes if it is a Unicode font with special characters that cannot be displayed correctly in the list of fonts in MuseScore. Or it is a symbol font that has no letters. The fields reserved for the letters are then empty, which is why nothing can be displayed in the font list.

I'm afraid that's another problem. There is a thread (https://musescore.org/en/node/281905) about it and it is actually a bug in MuseScore 3. I also tried it with the last developer version (https://ftp.osuosl.org/pub/musescore-nightlies/windows/), even there the bug still exists. The Jazz fonts are installed with MuseScore and should actually work, strange that nobody came across this bug before the release. If you absolutely need the jazz font, then you have to switch to MuseScore 2.

As I stated in another thread: according to Qt issue tracker, the Windows 10 (1809) font bug has been fixed since version 5.12.2 (https://bugreports.qt.io/browse/QTBUG-73241). Krita 4.1.7 seems to list all font types. Jazz font is displayed correctly and can be used as well as other problem fonts that have been listed here. Wouldn't it be possible to use Qt 5.12.2 or higher for MuseScore for Windows? Maybe another fontengine is used in Krita? And perhaps you could ask Krita & Co team what they use exactly or what they do differently.

I can't confirm that:

I'm using Windows 10, 1809. I think with Windows 10 it ist very important to mention the version as well. This should be part of the information you can copy out of MuseScore (if MuseScore is able to retrieve this information).
As I said in Krita, it works:

As someone from the Qt issue report mentioned above said, it seems to work with the "default font engine" (whatever that means, of course I don't know what you're using, nor how it works in Krita):
Mårten Nordheim added a comment - 28 Jan '19 9:50 AM
Tested locally with the fontsampler example and reproduced for the freetype engine, with the default fontengine I see the user font I installed.

@ABL: 👍 I did what you said and in fact if you turn off the freetype engine, those font problems are gone:

For people who want to use MS3 and depend on certain non-working fonts, this would at least be a workaround.
I can still remember the problems with kerning in the Windows version. But in my opinion non-functioning fonts are even worse. The question is how other Qt based projects solved the problem. Krita will probably also use the default font engine, but I haven't tested whether kerning is bad there as well (for Scribus as a DTP program, for example, kerning certainly plays an important role, but they still use Qt 5.6.3).

What the Qt guys did fix was the problem of missing fonts if fonts were installed in Windows 10 1809 only for the current user. These fonts no longer end up in the usual Windows\Fonts directory.

This was the description of the Qt font issue with Windows 10 1809 (https://bugreports.qt.io/browse/QTBUG-73241), which was fixed in 5.12.2:

Windows update 1809 introduced new location for system fonts. Previously the fonts were installed in all-users location C:\Windows\Fonts, but in Windows update 1809 the fonts are installed in user specific location C:\Users\UserName\AppData\Local\Microsoft\Windows\Fonts. Now, Qt cannot find system fonts on systems with Windows update 1809.

Steps to reproduce:

Install new font
Query fonts with QFontDatabase::families() or use Qt's Font Sampler example.
The newly installed font is not on the list

However, this has nothing to do with the second problem, that fonts do not appear at all, even if they have been installed for all users. The JazzText font installed with MuseScore appears, but cannot be used. If you switch off the Freetype engine, the JazzText works again and the invisible fonts (e.g. Nyala) reappear in the list.

Sorry, but there are still fonts, like Nyala, that don't work in MuseScore 3.x.
If you absolutely need the Nyala font for a music notation project, then at the moment you still need to use the older, still available MuseScore 2 (you can install MuseScore 3 and 2 side by side on your computer, they don't interfere).
Download link to MuseScore 2 for Windows:
https://musescore.org/de/download/musescore-2.3.2.msi

@etienne: The solution to install a problematic font with the option "for all users" does not work for all fonts. There are different ways to make a font and depending on how it was made, MuseScore 3.x may or may not display it on Windows (10).
By default MuseScore 3.x uses a different font engine than MuseScore 2. There is another solution where you have to change exactly this default font engine to the old font engine. Did you try this solution? This might solve your problem.
This solution from ABL is within this thread (see above, search for "qt.conf"). Did you try that with the modified qt.conf file? Or did you just try to install the font as admin for all users?
As I said, the solution with the modified qt.conf to use the old font engine should work.

What didn't work, installing the problematic font on Windows 10 (does not work until version 1809 or later) for all users so that the font can be used in MuseScore, or editing the "qt.conf" file as described above to switch to the alternative font engine?
Which font are we talking about?