GTK/X11: empty "Set Highlight" menu

[hillu]

On my system, GTK seems to be configured to not show icons in menus. (I haven't figured out how o enable those), so while the submenu contains six entries that result in highlights with different colors, visually it appears to be entirely empty.

I suggest adding a text representation to the menu. The following is too simple because it ends up producing rgb(x, y, z) entries for everything but "red" on my system.

index d106dea..844ef85 100644
--- a/src/Tab.cpp
+++ b/src/Tab.cpp
@@ -1003,10 +1003,10 @@ void REHex::Tab::OnDataRightClick(wxCommandEvent &event)
                
                for(int i = 0; i < Palette::NUM_HIGHLIGHT_COLOURS; ++i)
                {
-                       wxMenuItem *itm = new wxMenuItem(hlmenu, wxID_ANY, " ");
-
                        wxColour bg_colour = active_palette->get_highlight_bg(i);
                        
+                       wxMenuItem *itm = new wxMenuItem(hlmenu, wxID_ANY, bg_colour.GetAsString());
+
                        /* TODO: Get appropriate size for menu bitmap.
                         * TODO: Draw a character in image using foreground colour.
                        */