Route UI state persistence through adapter

src/app_layout.cpp

@@ -24,6 +24,7 @@
 #include "legacy_canvas_tool_services.h"
 #include "legacy_document_layer_services.h"
 #include "legacy_history_services.h"
+#include "legacy_preference_storage.h"
 #include "legacy_ui_overlay_services.h"
 #include "settings.h"
 #include "serializer.h"
@@ -1539,8 +1540,7 @@ void App::set_ui_scale(float scale)
     const auto plan = pp::app::plan_ui_scale(scale, display_density);
     zoom = plan.scale;
     FontManager::change_scale(plan.font_scale);
-    Settings::set("ui-scale", Serializer::Float(plan.scale));
-    Settings::save();
+    pp::panopainter::save_legacy_float_preference("ui-scale", plan.scale);
     App::I->title_update();
 }
 
@@ -1605,11 +1605,11 @@ void App::ui_save()
     }
     d.set("drop-right", list_drop_right);
 
-    Settings::set("ui", d);
-    Settings::set("ui-rtl", Serializer::Boolean(ui_rtl));
+    pp::panopainter::set_legacy_descriptor_preference("ui", d);
+    pp::panopainter::set_legacy_boolean_preference("ui-rtl", ui_rtl);
     save_platform_ui_state();
 
-    Settings::save();
+    pp::panopainter::save_legacy_preferences();
 }
 
 void App::ui_restore()

src/legacy_preference_storage.cpp

@@ -12,9 +12,19 @@ void set_legacy_integer_preference(const char* key, int value)
     Settings::set(key, Serializer::Integer(value));
 }
 
-void save_legacy_boolean_preference(const char* key, bool value)
+void set_legacy_boolean_preference(const char* key, bool value)
 {
     Settings::set(key, Serializer::Boolean(value));
+}
+
+void set_legacy_descriptor_preference(const char* key, const Serializer::Descriptor& value)
+{
+    Settings::set(key, value);
+}
+
+void save_legacy_boolean_preference(const char* key, bool value)
+{
+    set_legacy_boolean_preference(key, value);
     Settings::save();
 }
 

src/legacy_preference_storage.h

@@ -1,8 +1,12 @@
 #pragma once
 
+#include "serializer.h"
+
 namespace pp::panopainter {
 
 void set_legacy_integer_preference(const char* key, int value);
+void set_legacy_boolean_preference(const char* key, bool value);
+void set_legacy_descriptor_preference(const char* key, const Serializer::Descriptor& value);
 void save_legacy_boolean_preference(const char* key, bool value);
 void save_legacy_float_preference(const char* key, float value);
 bool save_legacy_preferences();