stop writing imgui.ini

src/main.cpp

@@ -342,6 +342,14 @@ class VulkanApp {
     IMGUI_CHECKVERSION();
     ImGui::CreateContext();
 
+    // Remember to use a reference here, otherwise
+    // the ImGui::GetIO() function will return a
+    // copy and the changes won't be saved.
+    ImGuiIO& imGuiIO = ImGui::GetIO();
+
+    // Disable writing imgui.ini
+    imGuiIO.IniFilename = nullptr;
+
     // Setup Dear ImGui style
     ImGui::StyleColorsDark();