tdf#141963 put focus in vcl parent during Function key processing

Change-Id: Ib63567c9ce208cb7dd522a1bce9d99fa44a72554
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/114883
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
diff --git a/vcl/unx/gtk3/gtk3gtkframe.cxx b/vcl/unx/gtk3/gtk3gtkframe.cxx
index d337047..fa46f13 100644
--- a/vcl/unx/gtk3/gtk3gtkframe.cxx
+++ b/vcl/unx/gtk3/gtk3gtkframe.cxx
@@ -94,6 +94,12 @@ sal_uInt16 GtkSalFrame::GetMouseModCode( guint state )
    return nCode;
}

// KEY_F26 is the last function key known to keycodes.hxx
static bool IsFunctionKeyVal(guint keyval)
{
    return keyval >= GDK_KEY_F1 && keyval <= GDK_KEY_F26;
}

sal_uInt16 GtkSalFrame::GetKeyCode(guint keyval)
{
    sal_uInt16 nCode = 0;
@@ -105,8 +111,7 @@ sal_uInt16 GtkSalFrame::GetKeyCode(guint keyval)
        nCode = KEY_A + (keyval-GDK_KEY_A );
    else if( keyval >= GDK_KEY_a && keyval <= GDK_KEY_z )
        nCode = KEY_A + (keyval-GDK_KEY_a );
    else if( keyval >= GDK_KEY_F1 && keyval <= GDK_KEY_F26 )
    // KEY_F26 is the last function key known to keycodes.hxx
    else if (IsFunctionKeyVal(keyval))
    {
        switch( keyval )
        {
@@ -3271,8 +3276,9 @@ gboolean GtkSalFrame::signalKey(GtkWidget* pWidget, GdkEventKey* pEvent, gpointe
            // InterimItemWindow and send unconsumed keystrokes to it to
            // support ctrl-q etc shortcuts. Only bother to search for the
            // InterimItemWindow if it is a toplevel that fills its frame, or
            // the keystroke is F6 to switch between task-panels
            if (pThis->IsCycleFocusOutDisallowed() || pEvent->keyval == GDK_KEY_F6)
            // the keystroke is sufficiently special its worth passing on,
            // e.g. F6 to switch between task-panels or F5 to close a navigator
            if (pThis->IsCycleFocusOutDisallowed() || IsFunctionKeyVal(pEvent->keyval))
            {
                GtkWidget* pSearch = pFocusWindow;
                while (pSearch)