Fix define on flatpak, add cwd behavior.

src/main/main.cpp

@@ -601,7 +601,14 @@ int main(int argc, char** argv) {
     // Force wasapi on Windows, as there seems to be some issue with sample queueing with directsound currently.
     SDL_setenv("SDL_AUDIODRIVER", "wasapi", true);
 #endif
-    //printf("Current dir: %ls\n", std::filesystem::current_path().c_str());
+    
+#if defined(__linux__) && defined(RECOMP_FLATPAK)
+    // When using Flatpak, applications tend to launch from the home directory by default.
+    // Mods might use the current working directory to store the data, so we switch it to a directory
+    // with persistent data storage and write permissions under Flatpak to ensure it works.
+    std::error_code ec;
+    std::filesystem::current_path("/var/data", ec);
+#endif
 
     // Initialize SDL audio and set the output frequency.
     SDL_InitSubSystem(SDL_INIT_AUDIO);