drop scroll-wheel moves notebook page workaround

now that the double-decker monstrosity is in place

Change-Id: I8bc8f98d0cfd2bf4506bbc61632c1e7b0f9cd3f1
Reviewed-on: https://gerrit.libreoffice.org/65181
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

vcl/unx/gtk3/gtk3gtkinst.cxx

@@ -3112,7 +3112,6 @@ private:
     gulong m_nSwitchPageSignalId;
     gulong m_nOverFlowSwitchPageSignalId;
     gulong m_nSizeAllocateSignalId;
-    gulong m_nScrollSignalId;
     bool m_bOverFlowBoxActive;
     bool m_bOverFlowBoxIsStart;
     int m_nStartTabCount;
@@ -3207,59 +3206,6 @@ private:
         enable_notify_events();
     }
 
-    static gboolean signalScroll(GtkWidget*, GdkEventScroll* event, gpointer widget)
-    {
-        GtkInstanceNotebook* pThis = static_cast<GtkInstanceNotebook*>(widget);
-        return pThis->signal_scroll(event);
-    }
-
-    bool signal_scroll(GdkEventScroll* event)
-    {
-        GtkWidget* pEventWidget = gtk_get_event_widget(reinterpret_cast<GdkEvent*>(event));
-        if (!pEventWidget)
-            return false;
-
-        /* ignore page content scroll events */
-        GtkWidget* pPage = gtk_notebook_get_nth_page(m_pNotebook, gtk_notebook_get_current_page(m_pNotebook));
-        if (gtk_widget_is_ancestor(pEventWidget, pPage) || pPage == pEventWidget)
-            return false;
-
-        bool bNext(false), bPrev(false);
-        switch (event->direction)
-        {
-            case GDK_SCROLL_RIGHT:
-            case GDK_SCROLL_DOWN:
-                bNext = true;
-                break;
-            case GDK_SCROLL_LEFT:
-            case GDK_SCROLL_UP:
-                bPrev = true;
-                break;
-            case GDK_SCROLL_SMOOTH:
-            {
-                switch (gtk_notebook_get_tab_pos(m_pNotebook))
-                {
-                    case GTK_POS_LEFT:
-                    case GTK_POS_RIGHT:
-                        bNext = event->delta_y > 0;
-                        bPrev = event->delta_y < 0;
-                        break;
-                    case GTK_POS_TOP:
-                    case GTK_POS_BOTTOM:
-                        bNext = event->delta_x > 0;
-                        bPrev = event->delta_x < 0;
-                        break;
-                }
-                break;
-            }
-        }
-        if (bNext)
-            gtk_notebook_next_page(m_pNotebook);
-        else if (bPrev)
-            gtk_notebook_prev_page(m_pNotebook);
-        return true;
-    }
-
     static OString get_page_ident(GtkNotebook *pNotebook, guint nPage)
     {
         const GtkWidget* pTabWidget = gtk_notebook_get_tab_label(pNotebook, gtk_notebook_get_nth_page(pNotebook, nPage));
@@ -3540,7 +3486,6 @@ public:
         , m_nEndTabCount(0)
     {
         gtk_widget_add_events(GTK_WIDGET(pNotebook), GDK_SCROLL_MASK);
-        m_nScrollSignalId = g_signal_connect(pNotebook, "scroll-event", G_CALLBACK(signalScroll), this);
         if (get_n_pages() > 6)
             m_nSizeAllocateSignalId = g_signal_connect_after(pNotebook, "size-allocate", G_CALLBACK(signalSizeAllocate), this);
         else
@@ -3710,7 +3655,6 @@ public:
     {
         if (m_nSizeAllocateSignalId)
             g_signal_handler_disconnect(m_pNotebook, m_nSizeAllocateSignalId);
-        g_signal_handler_disconnect(m_pNotebook, m_nScrollSignalId);
         g_signal_handler_disconnect(m_pNotebook, m_nSwitchPageSignalId);
         g_signal_handler_disconnect(m_pOverFlowNotebook, m_nOverFlowSwitchPageSignalId);
         gtk_widget_destroy(GTK_WIDGET(m_pOverFlowNotebook));