Forcing a print bed update after config or config bundle is loaded.

The solution is hackish, but a major refactoring would be needed
to avoid multiple refreshes of the print bed, and to avoid
expensive checks at Plater::on_config_change() every time
a config value changes at a parameter tab.

src/slic3r/GUI/GUI_App.cpp

@@ -960,8 +960,11 @@ void GUI_App::load_current_presets()
 	this->plater()->set_printer_technology(printer_technology);
     for (Tab *tab : tabs_list)
 		if (tab->supports_printer_technology(printer_technology)) {
-			if (tab->type() == Preset::TYPE_PRINTER)
+			if (tab->type() == Preset::TYPE_PRINTER) {
 				static_cast<TabPrinter*>(tab)->update_pages();
+				// Mark the plater to update print bed by tab->load_current_preset() from Plater::on_config_change().
+				this->plater()->force_print_bed_update();
+			}
 			tab->load_current_preset();
 		}
 }

src/slic3r/GUI/Plater.cpp

@@ -5376,6 +5376,13 @@ void Plater::force_filament_colors_update()
         this->p->schedule_background_process();
 }
 
+void Plater::force_print_bed_update()
+{
+	// Fill in the printer model key with something which cannot possibly be valid, so that Plater::on_config_change() will update the print bed
+	// once a new Printer profile config is loaded.
+	p->config->opt_string("printer_model", true) = "\x01\x00\x01";
+}
+
 void Plater::on_activate()
 {
 #ifdef __linux__
@@ -5392,11 +5399,6 @@ void Plater::on_activate()
 	this->p->show_delayed_error_message();
 }
 
-const DynamicPrintConfig* Plater::get_plater_config() const
-{
-    return p->config;
-}
-
 // Get vector of extruder colors considering filament color, if extruder color is undefined.
 std::vector<std::string> Plater::get_extruder_colors_from_plater_config() const
 {

src/slic3r/GUI/Plater.hpp

@@ -227,9 +227,9 @@ public:
     void on_extruders_change(size_t extruders_count);
     void on_config_change(const DynamicPrintConfig &config);
     void force_filament_colors_update();
+    void force_print_bed_update();
     // On activating the parent window.
     void on_activate();
-    const DynamicPrintConfig* get_plater_config() const;
     std::vector<std::string> get_extruder_colors_from_plater_config() const;
     std::vector<std::string> get_colors_for_color_print() const;
 

src/slic3r/GUI/PresetBundle.hpp

@@ -54,8 +54,7 @@ public:
 
     // There will be an entry for each system profile loaded, 
     // and the system profiles will point to the VendorProfile instances owned by PresetBundle::vendors.
-    // std::set<VendorProfile>     vendors;
+    VendorMap                   vendors;
-    VendorMap                      vendors;
 
     struct ObsoletePresets {
         std::vector<std::string> prints;