macOS: add basic menubar support

src/qt/macoshelper.h

@@ -40,6 +40,7 @@ public:
     static bool openFolderAndSelectItem(const QUrl &path);
     static QPixmap screenshot();
     static QString bundlePath();
+    static void disableWindowTabbing();
 };
 
 #endif //MACOSHELPER_H

src/qt/macoshelper.mm

@@ -41,6 +41,14 @@
 
 #include "ScopeGuard.h"
 
+void MacOSHelper::disableWindowTabbing()
+{
+#ifdef __MAC_10_12
+    if ([NSWindow respondsToSelector:@selector(allowsAutomaticWindowTabbing)])
+        [NSWindow setAllowsAutomaticWindowTabbing: NO];
+#endif
+}
+
 bool MacOSHelper::isCapsLock()
 {
 #ifdef __MAC_10_12