Not all available special characters have a preview in the special characters dialog

[henkdegroot]

Issue type

UI bug (incorrect info or interface appearance)

Description with steps to reproduce

Open the Special Characters dialog and check the contents. Some "spaces" exists in dialog which do contain characters and these characters can even be used/inserted in text and show correct in the score.

Some characters were displayed correct in MS 3.6.2:

Same dialog in MS4:

This even leads to some people believing certain characters no longer exists, as they can't tell from looking at the empty positions that the characters they want to use still exist.

Another difference between MS 3.6.2 and MS 4 is that some characters in MS 3.6.2 are displayed as a square, while these now are empty/space in MS 4.

Hope this can be improved.

Supporting files, videos and screenshots

Screenshots included in bug description.

What is the latest version of MuseScore Studio where this issue is present?

4.5.0

Regression

Yes, this used to work in MuseScore 3.x and now is broken

Operating system

Windows 11

Additional context

No response

Checklist

• This report follows the guidelines for reporting bugs and issues
• I have verified that this issue has not been logged before, by searching the issue tracker for similar issues
• I have attached all requested files and information to this report
• I have attempted to identify the root problem as concisely as possible, and have used minimal reproducible examples where possible

[Jojo-Schmitz]

The blank ones (Mu3 and Mu4):

MuseScore/src/palette/view/widgets/specialcharactersdialog.cpp

Lines 615 to 622 in 9033dc2

	0x2153, // ⅓ ?
	0x2154, // ⅔ ?
	0x2155, // ⅕ ?
	0x2156, // ⅖ ?
	0x2157, // ⅗ ?
	0x2158, // ⅘ ?
	0x2159, // ⅙ ?
	0x215A, // ⅚ ?

The newly 2 missing ones (Mu4:

MuseScore/src/palette/view/widgets/specialcharactersdialog.cpp

Lines 628 to 631 in 9033dc2

	//0x203F, // undertie
	0x035c, // curved ligature to connect two syllables
	//0x2040, // character tie
	0x0361, // curved ligature (top)

I suspect they are missing fron Edwin (although that doesn't explain the 2 missing from Mu4?!?)

Interestingly they do show in the tool tips (i.e. when hovering over them with the mouse). And can succesfully get added to the score, so are not missing at all.

[LupusCaeruleus]

although that doesn't explain the 2 missing from Mu4?!?

Looks like the cause is likely the same as #19252, since both are zero-width characters.

Another piece of evidence: all Unicode Combining Diacritical Marks are invisible.

[Jojo-Schmitz]

Ah, makes sense