small refactoring of FbTk/Menu code

* removed useless struct _menu
* code deduplication via renderMenuPixmap()
* improved documentation:
   - 'sublevel' actually means 'column'
   - 'persub' means 'row_per_column'

1 files changed, 1 insertions, 1 deletions

diff --git a/src/Slit.cc b/src/Slit.cc
index acbd922..bdd1a28 100644
--- a/src/Slit.cc
+++ b/src/Slit.cc
@@ -1241,7 +1241,7 @@ void Slit::setupMenu() {
 
     // setup sub menu
     placement_menu->setLabel(_FB_XTEXT(Slit, Placement, "Slit Placement", "Slit Placement"));
-    placement_menu->setMinimumSublevels(3);
+    placement_menu->setMinimumColumns(3);
     m_layermenu->setInternalMenu();
     m_clientlist_menu.setInternalMenu();
     m_slitmenu.setInternalMenu();