FIX: Prompting flush options not take effect when disable wipe tower

Change-Id: Id1195880ebe6021136446dc02ea46224aff4e801
(cherry picked from commit 7edd7f389c97acad8baa0bb809914d3aeeb75fd8)

src/libslic3r/PrintConfig.cpp

@@ -2813,21 +2813,24 @@ void PrintConfigDef::init_fff_params()
     def->label = L("Flush into objects' infill");
     def->tooltip = L("Purging after filament change will be done inside objects' infills. "
         "This may lower the amount of waste and decrease the print time. "
-        "If the walls are printed with transparent filament, the mixed color infill will be seen outside");
+        "If the walls are printed with transparent filament, the mixed color infill will be seen outside. "
+        "It will not take effect, unless the prime tower is enabled.");
     def->set_default_value(new ConfigOptionBool(false));
 
     def = this->add("flush_into_support", coBool);
     def->category = L("Flush options");
     def->label = L("Flush into objects' support");
     def->tooltip = L("Purging after filament change will be done inside objects' support. "
-        "This may lower the amount of waste and decrease the print time");
+        "This may lower the amount of waste and decrease the print time. "
+        "It will not take effect, unless the prime tower is enabled.");
     def->set_default_value(new ConfigOptionBool(true));
 
     def = this->add("flush_into_objects", coBool);
     def->category = L("Flush options");
     def->label = L("Flush into this object");
     def->tooltip = L("This object will be used to purge the nozzle after a filament change to save filament and decrease the print time. "
-        "Colours of the objects will be mixed as a result");
+        "Colours of the objects will be mixed as a result. "
+        "It will not take effect, unless the prime tower is enabled.");
     def->set_default_value(new ConfigOptionBool(false));
 
     //BBS

src/slic3r/GUI/ConfigManipulation.cpp

@@ -586,6 +586,9 @@ void ConfigManipulation::toggle_print_fff_options(DynamicPrintConfig *config, co
     for (auto el : { "prime_tower_width", "prime_volume", "prime_tower_brim_width"})
         toggle_line(el, have_prime_tower);
 
+    for (auto el : {"flush_into_infill", "flush_into_support", "flush_into_objects"})
+        toggle_field(el, have_prime_tower);
+
     bool have_avoid_crossing_perimeters = config->opt_bool("reduce_crossing_wall");
     toggle_line("max_travel_detour_distance", have_avoid_crossing_perimeters);