修复若干问题

web_server/app/Web_Plot_Session.cpp

@@ -49,7 +49,7 @@ double gaussian(double x, double center, double width) {
 }
 } // namespace
 struct Web_Plot_Session::Impl {
-    Scene2D plot;
+    Plot_Scene plot;
     renderive_Owner<Frequency_Axis> spectrum_frequency_axis;
     renderive_Owner<Axis> spectrum_power_axis;
     renderive_Owner<Frequency_Axis> waterfall_frequency_axis;
@@ -306,7 +306,7 @@ struct Web_Plot_Session::Impl {
                 }
                 else if constexpr (std::is_same_v<T, Set_Demo_Mode>) {
                     mode = value.mode;
-                    plot.notify_model_dirty();
+                    plot.request_redraw();
                 }
                 else if constexpr (std::is_same_v<T, Set_Center_Frequency>) {
                     set_center_frequency(value.megahertz);
@@ -316,7 +316,7 @@ struct Web_Plot_Session::Impl {
                 }
                 else if constexpr (std::is_same_v<T, Set_Gain>) {
                     gain_db = value.decibels;
-                    plot.notify_model_dirty();
+                    plot.request_redraw();
                 }
                 else if constexpr (std::is_same_v<T, Set_Max_Hold>) {
                     spectrum->set<&Spectrum::Properties::max_hold_visible>(value.enabled);