[Interest] Missing glyphs using Qt 5(.3+?) on Macintosh

[Adam Light]

I noticed today that when I build my application using Qt 5.4 from the dev
branch and I try to display certain mathematical symbols (say, in a
QPlainTextEdit), I get the empty square box glyph instead of the correct
symbol glyph.

When I build using Qt 4.8.6, I get the correct symbols displayed.

I have only tested this on Mac OSX 10.9.4.

An example of a character that does not display properly is ∯ (that's
U+222F, SURFACE INTEGRAL). There are at least 20 other symbols with similar
problems that I've noticed.

I can reproduce this problem using a Qt creator snapshot I've downloaded
recently:

Based on Qt 5.3.1 (Clang 5.0 (Apple), 64 bit)

Built on Jul 14 2014 at 04:12:53

>From revision c30856e657


If you set the cursor in a text editor for a file or a line edit (eg. the
Find line edit) and insert this symbol by pasting or by using the system
Character Viewer application, Creator draws the empty box. I don't have an
old version of Creator built with Qt 4 to test, but I assume the symbol
would show up correctly in an older version.


I've searched the bug reports for something similar and the closest issue I
could find is https://bugreports.qt-project.org/browse/QTBUG-13206 but that
report is very old and against Qt 4.6.


Has anyone else come across this problem? I'm happy to file a new bug
report but since it's hard for me to come up with good search terms for
this I thought I'd see if anyone else is familiar with this problem before
I do so.


Thanks

Adam
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