gtk3: crash on reusing a popup menu that has a sub menu

Typically popup menus are created froms scratch each time, which is why
this wasn't a common problem.

To reproduce, under gtk3, set a template as default in the template manager,
reset it using dropdown, now set another template as default, and reopen the
menu.. it crashes

Change-Id: I6107fbd921ada71ef7d676031651deb4b1b2d2fb

1 files changed, 14 insertions, 0 deletions

diff --git a/vcl/unx/gtk/gtksalmenu.cxx b/vcl/unx/gtk/gtksalmenu.cxx
index 6a8d52ac4584..414b6b0ed795 100644
--- a/vcl/unx/gtk/gtksalmenu.cxx
+++ b/vcl/unx/gtk/gtksalmenu.cxx
@@ -400,6 +400,7 @@ bool GtkSalMenu::ShowNativePopupMenu(FloatingWindow* pWin, const Rectangle& rRec
     gtk_widget_destroy(pWidget);
 
     g_object_unref(mpActionGroup);
+    ClearActionGroupAndMenuModel();
 
     return true;
 #else
@@ -1003,6 +1004,19 @@ void GtkSalMenu::ActivateAllSubmenus(Menu* pMenuBar)
     }
 }
 
+void GtkSalMenu::ClearActionGroupAndMenuModel()
+{
+    SetMenuModel(nullptr);
+    mpActionGroup = nullptr;
+    for (GtkSalMenuItem* pSalItem : maItems)
+    {
+        if ( pSalItem->mpSubMenu != nullptr )
+        {
+            pSalItem->mpSubMenu->ClearActionGroupAndMenuModel();
+        }
+    }
+}
+
 void GtkSalMenu::Activate(const gchar* pCommand)
 {
     MenuAndId aMenuAndId = decode_command(pCommand);