WIP: Allows regions of MMU segmentation to be trimmed by chosen width.

src/slic3r/GUI/Tab.cpp

@@ -1586,6 +1586,7 @@ void TabPrint::build()
 
         optgroup = page->new_optgroup(L("Advanced"));
         optgroup->append_single_option_line("interface_shells");
+        optgroup->append_single_option_line("mmu_segmented_region_max_width");
 
     page = add_options_page(L("Advanced"), "wrench");
         optgroup = page->new_optgroup(L("Extrusion width"));