Stop handling performKeyEquivalent: in wxOSX

We can't handle the accelerators (known as "key equivalents" in Cocoa)
in this function because it is called for the views in top to bottom
order, while wx semantics is for accelerators to be handled in the
accelerator table closest to the focused window.

So just remove this code and rely on accelerator handling happening in
wxWindowMac::OSXHandleKeyEvent() instead.

Closes #13937.

include/wx/osx/cocoa/private.h

@@ -185,7 +185,6 @@ public :
     virtual void                keyEvent(WX_NSEvent event, WXWidget slf, void* _cmd);
     virtual void                insertText(NSString* text, WXWidget slf, void* _cmd);
     virtual void                doCommandBySelector(void* sel, WXWidget slf, void* _cmd);
-    virtual bool                performKeyEquivalent(WX_NSEvent event, WXWidget slf, void* _cmd);
     virtual bool                acceptsFirstResponder(WXWidget slf, void* _cmd);
     virtual bool                becomeFirstResponder(WXWidget slf, void* _cmd);
     virtual bool                resignFirstResponder(WXWidget slf, void* _cmd);

src/osx/cocoa/textctrl.mm

@@ -368,12 +368,6 @@ NSView* wxMacEditHelper::ms_viewCurrentlyEdited = nil;
         [super flagsChanged:event];
 }
 
-- (BOOL) performKeyEquivalent:(NSEvent*) event
-{
-    BOOL retval = [super performKeyEquivalent:event];
-    return retval;
-}
-
 - (void) insertText:(id) str
 {
     // We should never generate char events for the text being inserted

src/osx/cocoa/window.mm

@@ -1197,15 +1197,6 @@ void wxOSX_touchesEnded(NSView* self, SEL _cmd, NSEvent *event)
 }
 #endif // MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_10
 
-BOOL wxOSX_performKeyEquivalent(NSView* self, SEL _cmd, NSEvent *event)
-{
-    wxWidgetCocoaImpl* impl = (wxWidgetCocoaImpl* ) wxWidgetImpl::FindFromWXWidget( self );
-    if (impl == NULL)
-        return NO;
-
-    return impl->performKeyEquivalent(event, self, _cmd);
-}
-
 BOOL wxOSX_acceptsFirstResponder(NSView* self, SEL _cmd)
 {
     wxWidgetCocoaImpl* impl = (wxWidgetCocoaImpl* ) wxWidgetImpl::FindFromWXWidget( self );
@@ -2212,45 +2203,6 @@ void wxWidgetCocoaImpl::doCommandBySelector(void* sel, WXWidget slf, void* _cmd)
     }
 }
 
-bool wxWidgetCocoaImpl::performKeyEquivalent(WX_NSEvent event, WXWidget slf, void *_cmd)
-{
-    wxLogTrace(TRACE_KEYS, "Got %s for %s",
-               wxDumpSelector((SEL)_cmd), wxDumpNSView(slf));
-
-    bool handled = false;
-    
-    wxKeyEvent wxevent(wxEVT_KEY_DOWN);
-    SetupKeyEvent( wxevent, event );
-   
-    // because performKeyEquivalent is going up the entire view hierarchy, we don't have to
-    // walk up the ancestors ourselves but let cocoa do it
-#if wxUSE_ACCEL
-    int command = m_wxPeer->GetAcceleratorTable()->GetCommand( wxevent );
-    if (command != -1)
-    {
-        wxEvtHandler * const handler = m_wxPeer->GetEventHandler();
-        
-        wxCommandEvent command_event( wxEVT_MENU, command );
-        command_event.SetEventObject( wxevent.GetEventObject() );
-        handled = handler->ProcessEvent( command_event );
-        
-        if ( !handled )
-        {
-            // accelerators can also be used with buttons, try them too
-            command_event.SetEventType(wxEVT_BUTTON);
-            handled = handler->ProcessEvent( command_event );
-        }
-    }
-#endif // wxUSE_ACCEL
-
-    if ( !handled )
-    {
-        wxOSX_PerformKeyEventHandlerPtr superimpl = (wxOSX_PerformKeyEventHandlerPtr) [[slf superclass] instanceMethodForSelector:(SEL)_cmd];
-        return superimpl(slf, (SEL)_cmd, event);
-    }
-    return YES;
-}
-
 bool wxWidgetCocoaImpl::acceptsFirstResponder(WXWidget slf, void *_cmd)
 {
     if ( HasUserKeyHandling() )
@@ -2531,8 +2483,6 @@ void wxOSXCocoaClassAddWXMethods(Class c, wxOSXSkipOverrides skipFlags)
 
     wxOSX_CLASS_ADD_METHOD(c, @selector(insertText:), (IMP) wxOSX_insertText, "v@:@" )
 
-    wxOSX_CLASS_ADD_METHOD(c, @selector(performKeyEquivalent:), (IMP) wxOSX_performKeyEquivalent, "c@:@" )
-
     wxOSX_CLASS_ADD_METHOD(c, @selector(acceptsFirstResponder), (IMP) wxOSX_acceptsFirstResponder, "c@:" )
     wxOSX_CLASS_ADD_METHOD(c, @selector(becomeFirstResponder), (IMP) wxOSX_becomeFirstResponder, "c@:" )
     wxOSX_CLASS_ADD_METHOD(c, @selector(resignFirstResponder), (IMP) wxOSX_resignFirstResponder, "c@:" )