Invalidate print when G-code substitution is changed

+ DiffDialog: Fixed get_string_value() for "gcode_substitution"
+ some code refactoring :
    For PresetCollection added is_independent_from_extruder_number_option(opt_key)
    to check if option is from the list of options with vector variable, which is independent from number of extruders

src/libslic3r/Preset.cpp

@@ -1133,6 +1133,20 @@ void add_correct_opts_to_diff(const std::string &opt_key, t_config_option_keys&
     }
 }
 
+// list of options with vector variable, which is independent from number of extruders
+static const std::vector<std::string> independent_from_extruder_number_options = {
+    "bed_shape",
+    "filament_ramming_parameters",
+    "gcode_substitutions",
+    "compatible_prints",
+    "compatible_printers"
+};
+
+bool PresetCollection::is_independent_from_extruder_number_option(const std::string& opt_key)
+{
+    return std::find(independent_from_extruder_number_options.begin(), independent_from_extruder_number_options.end(), opt_key) != independent_from_extruder_number_options.end();
+}
+
 // Use deep_diff to correct return of changed options, considering individual options for each extruder.
 inline t_config_option_keys deep_diff(const ConfigBase &config_this, const ConfigBase &config_other)
 {
@@ -1142,7 +1156,7 @@ inline t_config_option_keys deep_diff(const ConfigBase &config_this, const Confi
         const ConfigOption *other_opt = config_other.option(opt_key);
         if (this_opt != nullptr && other_opt != nullptr && *this_opt != *other_opt)
         {
-            if (opt_key == "bed_shape" || opt_key == "thumbnails" || opt_key == "compatible_prints" || opt_key == "compatible_printers") {
+            if (PresetCollection::is_independent_from_extruder_number_option(opt_key)) {
                 // Scalar variable, or a vector variable, which is independent from number of extruders,
                 // thus the vector is presented to the user as a single input.
                 diff.emplace_back(opt_key);

src/libslic3r/Preset.hpp

@@ -556,6 +556,7 @@ private:
 public:
     static bool                     is_dirty(const Preset *edited, const Preset *reference);
     static std::vector<std::string> dirty_options(const Preset *edited, const Preset *reference, const bool deep_compare = false);
+    static bool                     is_independent_from_extruder_number_option(const std::string& opt_key);
 private:
     // Type of this PresetCollection: TYPE_PRINT, TYPE_FILAMENT or TYPE_PRINTER.
     Preset::Type            m_type;

src/slic3r/GUI/OptionsGroup.cpp

@@ -15,6 +15,7 @@
 #include "libslic3r/Exception.hpp"
 #include "libslic3r/Utils.hpp"
 #include "libslic3r/AppConfig.hpp"
+#include "libslic3r/Preset.hpp"
 #include "I18N.hpp"
 
 namespace Slic3r { namespace GUI {
@@ -596,8 +597,7 @@ void ConfigOptionsGroup::back_to_config_value(const DynamicPrintConfig& config,
 	}
     else if (m_opt_map.find(opt_key) == m_opt_map.end() ||
 		    // This option don't have corresponded field
-		     opt_key == "bed_shape"				|| opt_key == "filament_ramming_parameters" || opt_key == "gcode_substitutions" ||
-		     opt_key == "compatible_printers"	|| opt_key == "compatible_prints" ) {
+             PresetCollection::is_independent_from_extruder_number_option(opt_key) ) {
         value = get_config_value(config, opt_key);
         this->change_opt_value(opt_key, value);
         return;

src/slic3r/GUI/Tab.cpp

@@ -532,8 +532,7 @@ void Tab::update_label_colours()
             else
                 color = &m_modified_label_clr;
         }
-        if (opt.first == "bed_shape"            || opt.first == "filament_ramming_parameters" || 
-            opt.first == "compatible_prints"    || opt.first == "compatible_printers"           ) {
+        if (PresetCollection::is_independent_from_extruder_number_option(opt.first)) {
             if (m_colored_Label_colors.find(opt.first) != m_colored_Label_colors.end())
                 m_colored_Label_colors.at(opt.first) = *color;
             continue;
@@ -574,8 +573,7 @@ void Tab::decorate()
         Field*      field = nullptr;
         wxColour*   colored_label_clr = nullptr;
 
-        if (opt.first == "bed_shape" || opt.first == "filament_ramming_parameters" ||
-            opt.first == "compatible_prints" || opt.first == "compatible_printers")
+        if(PresetCollection::is_independent_from_extruder_number_option(opt.first))
             colored_label_clr = (m_colored_Label_colors.find(opt.first) == m_colored_Label_colors.end()) ? nullptr : &m_colored_Label_colors.at(opt.first);
 
         if (!colored_label_clr) {
@@ -4115,7 +4113,8 @@ wxSizer* TabPrint::create_substitutions_widget(wxWindow* parent)
 
     m_subst_manager.init(m_config, parent, grid_sizer);
     m_subst_manager.set_cb_edited_substitution([this]() {
-        update_changed_ui();
+        update_dirty();
+        wxGetApp().mainframe->on_config_changed(m_config); // invalidate print
     });
 
     auto sizer = new wxBoxSizer(wxHORIZONTAL);

src/slic3r/GUI/UnsavedChangesDialog.cpp

@@ -1156,6 +1156,14 @@ static wxString get_string_value(std::string opt_key, const DynamicPrintConfig&
                 out.RemoveLast(1);
                 return out;
             }
+            if (opt_key == "gcode_substitutions") {
+                if (!strings->empty())
+                    for (size_t id = 0; id < strings->size(); id += 3)
+                        out +=  from_u8(strings->get_at(id))     + ";\t" + 
+                                from_u8(strings->get_at(id + 1)) + ";\t" + 
+                                from_u8(strings->get_at(id + 2)) + ";\n";
+                return out;
+            }
             if (!strings->empty() && opt_idx < strings->values.size())
                 return from_u8(strings->get_at(opt_idx));
         }