UI: Use native combobox popup on macOS

As recommended by Qt on QTBUG-106162, this fixes QComboBox popups not
working with VoiceOver.

UI/obs-app.cpp

@@ -1249,7 +1249,7 @@ bool OBSApp::SetTheme(std::string name, std::string path)
 bool OBSApp::InitTheme()
 {
 	defaultPalette = palette();
-	setStyle(new OBSIgnoreWheelProxyStyle());
+	setStyle(new OBSProxyStyle());
 
 	const char *themeName =
 		config_get_string(globalConfig, "General", "CurrentTheme3");

UI/obs-proxy-style.cpp

@@ -77,13 +77,16 @@ OBSContextBarProxyStyle::generatedIconPixmap(QIcon::Mode iconMode,
 	return QProxyStyle::generatedIconPixmap(iconMode, pixmap, option);
 }
 
-int OBSIgnoreWheelProxyStyle::styleHint(StyleHint hint,
-					const QStyleOption *option,
-					const QWidget *widget,
-					QStyleHintReturn *returnData) const
+int OBSProxyStyle::styleHint(StyleHint hint, const QStyleOption *option,
+			     const QWidget *widget,
+			     QStyleHintReturn *returnData) const
 {
 	if (hint == SH_ComboBox_AllowWheelScrolling)
 		return 0;
+#ifdef __APPLE__
+	if (hint == SH_ComboBox_UseNativePopup)
+		return 1;
+#endif
 
 	return QProxyStyle::styleHint(hint, option, widget, returnData);
 }

UI/obs-proxy-style.hpp

@@ -2,14 +2,14 @@
 
 #include <QProxyStyle>
 
-class OBSIgnoreWheelProxyStyle : public QProxyStyle {
+class OBSProxyStyle : public QProxyStyle {
 public:
 	int styleHint(StyleHint hint, const QStyleOption *option,
 		      const QWidget *widget,
 		      QStyleHintReturn *returnData) const override;
 };
 
-class OBSContextBarProxyStyle : public OBSIgnoreWheelProxyStyle {
+class OBSContextBarProxyStyle : public OBSProxyStyle {
 public:
 	QPixmap generatedIconPixmap(QIcon::Mode iconMode, const QPixmap &pixmap,
 				    const QStyleOption *option) const override;