macOS: Replace category methods with functions

Objective-C category methods prohibit safe unloading of dynamic
libraries / plugins statically linked to Qt. Although they can be called in
convenient way they can be replaced with standalone functions without
noticeable drawback.

Remove unused qt_validModesForFontPanel category method.
Remove empty NSStatusItem (Qt) category.

Task-number: QTBUG-59884
Change-Id: I69503a115b1177623da91c67b62d72e56f43ffcf
Reviewed-by: Jake Petroules <jake.petroules@qt.io>

src/plugins/platforms/cocoa/qcocoaapplication.h

@@ -83,23 +83,11 @@
 // We mean it.
 //
 
-/*
-        Cocoa Application Categories
-*/
 #include "qglobal.h"
 #include "private/qcore_mac_p.h"
 
 #import <AppKit/AppKit.h>
 
-@class QT_MANGLE_NAMESPACE(QCocoaMenuLoader);
-
-@interface NSApplication (QT_MANGLE_NAMESPACE(QApplicationIntegration))
-- (void)QT_MANGLE_NAMESPACE(qt_setDockMenu):(NSMenu *)newMenu;
-- (int)QT_MANGLE_NAMESPACE(qt_validModesForFontPanel):(NSFontPanel *)fontPanel;
-
-- (void)QT_MANGLE_NAMESPACE(qt_sendPostedMessage):(NSEvent *)event;
-- (BOOL)QT_MANGLE_NAMESPACE(qt_filterEvent):(NSEvent *)event;
-@end
 
 @interface QT_MANGLE_NAMESPACE(QNSApplication) : NSApplication {
 }

src/plugins/platforms/cocoa/qcocoaapplication.mm

@@ -82,25 +82,7 @@
 
 QT_USE_NAMESPACE
 
-@implementation NSApplication (QT_MANGLE_NAMESPACE(QApplicationIntegration))
-
-- (void)QT_MANGLE_NAMESPACE(qt_setDockMenu):(NSMenu *)newMenu
-{
-    [[QT_MANGLE_NAMESPACE(QCocoaApplicationDelegate) sharedDelegate] setDockMenu:newMenu];
-}
-
-- (int)QT_MANGLE_NAMESPACE(qt_validModesForFontPanel):(NSFontPanel *)fontPanel
-{
-    Q_UNUSED(fontPanel);
-    // only display those things that QFont can handle
-    return NSFontPanelFaceModeMask
-            | NSFontPanelSizeModeMask
-            | NSFontPanelCollectionModeMask
-            | NSFontPanelUnderlineEffectModeMask
-            | NSFontPanelStrikethroughEffectModeMask;
-}
-
-- (void)QT_MANGLE_NAMESPACE(qt_sendPostedMessage):(NSEvent *)event
+static void qt_sendPostedMessage(NSEvent *event)
 {
     // WARNING: data1 and data2 is truncated to from 64-bit to 32-bit on OS 10.5!
     // That is why we need to split the address in two parts:
@@ -128,7 +110,7 @@ QT_USE_NAMESPACE
 
 static const QByteArray q_macLocalEventType = QByteArrayLiteral("mac_generic_NSEvent");
 
-- (BOOL)QT_MANGLE_NAMESPACE(qt_filterEvent):(NSEvent *)event
+static bool qt_filterEvent(NSEvent *event)
 {
     if (qApp && qApp->eventDispatcher()->
             filterNativeEvent(q_macLocalEventType, static_cast<void*>(event), 0))
@@ -137,7 +119,7 @@ static const QByteArray q_macLocalEventType = QByteArrayLiteral("mac_generic_NSE
     if ([event type] == NSApplicationDefined) {
         switch (static_cast<short>([event subtype])) {
             case QtCocoaEventSubTypePostMessage:
-                [NSApp QT_MANGLE_NAMESPACE(qt_sendPostedMessage):event];
+                qt_sendPostedMessage(event);
                 return true;
             default:
                 break;
@@ -147,8 +129,6 @@ static const QByteArray q_macLocalEventType = QByteArrayLiteral("mac_generic_NSE
     return false;
 }
 
-@end
-
 static void qt_maybeSendKeyEquivalentUpEvent(NSEvent *event)
 {
     // Cocoa is known for not sending key up events for key
@@ -180,7 +160,7 @@ static void qt_maybeSendKeyEquivalentUpEvent(NSEvent *event)
     // be called instead of sendEvent if redirection occurs.
     // 'self' will then be an instance of NSApplication
     // (and not QNSApplication)
-    if (![NSApp QT_MANGLE_NAMESPACE(qt_filterEvent):event]) {
+    if (!qt_filterEvent(event)) {
         [self QT_MANGLE_NAMESPACE(qt_sendEvent_original):event];
         qt_maybeSendKeyEquivalentUpEvent(event);
     }
@@ -190,7 +170,7 @@ static void qt_maybeSendKeyEquivalentUpEvent(NSEvent *event)
 {
     // This method will be called if
     // no redirection occurs
-    if (![NSApp QT_MANGLE_NAMESPACE(qt_filterEvent):event]) {
+    if (!qt_filterEvent(event)) {
         [super sendEvent:event];
         qt_maybeSendKeyEquivalentUpEvent(event);
     }

src/plugins/platforms/cocoa/qcocoanativeinterface.mm

@@ -42,7 +42,7 @@
 #include "qcocoamenu.h"
 #include "qcocoamenubar.h"
 #include "qcocoahelpers.h"
-#include "qcocoaapplication.h"
+#include "qcocoaapplicationdelegate.h"
 #include "qcocoaintegration.h"
 #include "qcocoaeventdispatcher.h"
 
@@ -256,7 +256,7 @@ void QCocoaNativeInterface::setDockMenu(QPlatformMenu *platformMenu)
     QMacAutoReleasePool pool;
     QCocoaMenu *cocoaPlatformMenu = static_cast<QCocoaMenu *>(platformMenu);
     NSMenu *menu = cocoaPlatformMenu->nsMenu();
-    [NSApp QT_MANGLE_NAMESPACE(qt_setDockMenu): menu];
+    [[QCocoaApplicationDelegate sharedDelegate] setDockMenu:menu];
 }
 
 void *QCocoaNativeInterface::qMenuToNSMenu(QPlatformMenu *platformMenu)

src/plugins/platforms/cocoa/qcocoasystemtrayicon.mm

@@ -289,9 +289,6 @@ void QCocoaSystemTrayIcon::showMessage(const QString &title, const QString &mess
 }
 QT_END_NAMESPACE
 
-@implementation NSStatusItem (Qt)
-@end
-
 @implementation QNSImageView
 -(id)initWithParent:(QNSStatusItem*)myParent {
     self = [super init];