dock icon's menu doesn't begin with separator anymore

... even when there's no open windows

Change-Id: I8c1d8f254e621d1867a100ad984f8b77ed8cfc5a
Reviewed-on: https://gerrit.libreoffice.org/19677
Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Norbert Thiebaud <nthiebaud@gmail.com>
diff --git a/sfx2/source/appl/shutdowniconaqua.mm b/sfx2/source/appl/shutdowniconaqua.mm
index 4fd1ee5..e231aac 100644
--- a/sfx2/source/appl/shutdowniconaqua.mm
+++ b/sfx2/source/appl/shutdowniconaqua.mm
@@ -487,9 +487,7 @@ void aqua_init_systray()
            if( [NSApp respondsToSelector: @selector(addDockMenuItem:)] )
            {
                [pDockSubMenu setSubmenu: pDockMenu];
                // insert a separator to the dock menu
                [NSApp performSelector:@selector(addDockMenuItem:) withObject: [NSMenuItem separatorItem]];
                // and now add the submenu
                // add the submenu
                [NSApp performSelector:@selector(addDockMenuItem:) withObject: pDockSubMenu];
            }
            else
diff --git a/vcl/osx/salframe.cxx b/vcl/osx/salframe.cxx
index 1ce314e..8634ce9 100644
--- a/vcl/osx/salframe.cxx
+++ b/vcl/osx/salframe.cxx
@@ -114,8 +114,13 @@ AquaSalFrame::~AquaSalFrame()
    delete mpGraphics;

    if( mpDockMenuEntry )
    {
        NSMenu* pDock = AquaSalInstance::GetDynamicDockMenu();
        // life cycle comment: the menu has ownership of the item, so no release
        [AquaSalInstance::GetDynamicDockMenu() removeItem: mpDockMenuEntry];
        [pDock removeItem: mpDockMenuEntry];
        if ( [[pDock itemAtIndex: 0] isSeparatorItem] )
            [pDock removeItemAtIndex: 0];
    }
    if ( mpNSView ) {
        [AquaA11yFactory revokeView: mpNSView];
        [mpNSView release];
@@ -298,6 +303,11 @@ void AquaSalFrame::SetTitle(const OUString& rTitle)
        if( mpDockMenuEntry == NULL )
        {
            NSMenu* pDock = AquaSalInstance::GetDynamicDockMenu();

            NSMenuItem* pTopItem = [pDock itemAtIndex: 0];
            if ( [pTopItem hasSubmenu] )
                [pDock insertItem: [NSMenuItem separatorItem] atIndex: 0];

            mpDockMenuEntry = [pDock insertItemWithTitle: pTitle
                                     action: @selector(dockMenuItemTriggered:)
                                     keyEquivalent: @""