Related tdf#38850 - Hide context-sensitive column unless experimental

Using a zero width does not work on gtk; this set_column_visible() method
was introduced in b1654a57b5

Change-Id: I1efbdfcb3a8b7224d066400501e9d68abc5c7a2c
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/199538
Tested-by: Jenkins
Reviewed-by: Michael Weghorn <m.weghorn@posteo.de>
Reviewed-by: Heiko Tietze <heiko.tietze@documentfoundation.org>

cui/source/dialogs/toolbartabpage.cxx

@@ -163,6 +163,9 @@ void ToolbarTabPage::Reset(const SfxItemSet* /* rSet*/)
             }
         }
     }
+    //TODO: context-sensitivity not working properly, see comment on tdf#38850
+    m_pToolbarList->set_column_visible(3, bIsExperimentalMode);
+
     m_pToolbarList->thaw();
     m_pToolbarList->make_sorted();
 
@@ -174,8 +177,6 @@ void ToolbarTabPage::Reset(const SfxItemSet* /* rSet*/)
         OUString sTitle = m_pToolbarList->get_column_title(i);
         aWidths.push_back(m_pToolbarList->get_pixel_size(sTitle).Width() + 12); // some padding
     }
-    if (!bIsExperimentalMode)
-        aWidths.push_back(0); // zero width for context_sensitive column, otherwise available space
     m_pToolbarList->set_column_fixed_widths(aWidths);
 
     // treeview height