[LyX/2.3.x] Hide multi-keystroke accelerators in Mac menu (bug 12693).

[Richard Kimberly Heck]

commit d04c40622251557a9628b31270d870cc87d765c2
Author: Pavel Sanda <sanda at lyx.org>
Date:   Wed Jul 5 20:45:26 2023 +0200

    Hide multi-keystroke accelerators in Mac menu (bug 12693).
    
    Patch from Juergen.
    
    (cherry picked from commit fb43449c80d8fdd31eb79a70aec8f70083d48b2e)
---
 src/frontends/qt4/Menus.cpp | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/frontends/qt4/Menus.cpp b/src/frontends/qt4/Menus.cpp
index a2505dc250..37f37a0b16 100644
--- a/src/frontends/qt4/Menus.cpp
+++ b/src/frontends/qt4/Menus.cpp
@@ -1982,8 +1982,16 @@ static QString label(MenuItem const & mi)
 	}
 
 	QString const binding = mi.binding();
+#if defined(Q_OS_MAC)
+	// MacOS cannot display complex bindings, so hide those
+	// https://doc.qt.io/qt-6/macos-issues.html#menu-actions
+	// #12693
+	if (!binding.isEmpty() && !binding.contains(" "))
+		label += '\t' + binding;
+#else
 	if (!binding.isEmpty())
 		label += '\t' + binding;
+#endif
 
 	return label;
 }