Preserve saved editor dock layouts

editor/src/UI/ImGuiSession.h

@@ -5,6 +5,7 @@
 #include <imgui.h>
 
 #include <filesystem>
+#include <fstream>
 #include <string>
 
 namespace XCEngine {
@@ -48,15 +49,17 @@ public:
         return m_iniPath;
     }
 
-    void SetProjectPath(const std::string& projectPath) {
+    bool SetProjectPath(const std::string& projectPath) {
         if (ImGui::GetCurrentContext() == nullptr) {
-            return;
+            return false;
         }
 
         SaveSettings();
         ImGuiIO& io = ImGui::GetIO();
         ConfigureIniFile(projectPath, io);
+        const bool hasSavedLayout = HasSavedDockLayoutOnDisk(m_iniPath);
         ImGui::LoadIniSettingsFromDisk(m_iniPath.c_str());
+        return hasSavedLayout;
     }
 
 private:
@@ -64,6 +67,27 @@ private:
     static constexpr const char* kPrimaryUiFontPath = "C:/Windows/Fonts/segoeui.ttf";
     static constexpr const char* kChineseFallbackFontPath = "C:/Windows/Fonts/msyh.ttc";
 
+    static bool HasSavedDockLayoutOnDisk(const std::filesystem::path& iniPath) {
+        std::error_code ec;
+        if (!std::filesystem::is_regular_file(iniPath, ec) || ec) {
+            return false;
+        }
+
+        std::ifstream input(iniPath, std::ios::in);
+        if (!input.is_open()) {
+            return false;
+        }
+
+        std::string line;
+        while (std::getline(input, line)) {
+            if (line == "[Docking][Data]") {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
     void ConfigureIniFile(const std::string& projectPath, ImGuiIO& io) {
         const std::filesystem::path configDir = std::filesystem::path(projectPath) / ".xceditor";
         std::error_code ec;