Fix logging to file

Fixes #21411

Common/Log/LogManager.cpp

@@ -199,13 +199,14 @@ void LogManager::SetFileLogPath(const Path &filename) {
 		fclose(fp_);
 	}
 
-	if (!filename.empty() && (outputs_ & LogOutput::File)) {
-		logFilename_ = Path(filename);
+	logFilename_ = Path(filename);
+
+	if (outputs_ & LogOutput::File) {
 		File::CreateFullPath(logFilename_.NavigateUp());
 		fp_ = File::OpenCFile(logFilename_, "at");
 		logFileOpenFailed_ = fp_ == nullptr;
 		if (logFileOpenFailed_) {
-			printf("Failed to open log file %s\n", filename.c_str());
+			printf("Failed to open log file %s\n", logFilename_.c_str());
 		}
 	}
 }

UI/DeveloperToolsScreen.cpp

@@ -166,6 +166,20 @@ void DeveloperToolsScreen::CreateGeneralTab(UI::LinearLayout *list) {
 		screenManager()->push(new LogConfigScreen());
 	});
 	list->Add(new CheckBox(&g_Config.bEnableFileLogging, dev->T("Log to file")))->SetEnabledPtr(&g_Config.bEnableLogging);
+	if (System_GetPropertyInt(SYSPROP_DEVICE_TYPE) == DEVICE_TYPE_DESKTOP) {
+		list->Add(new Choice(dev->T("Show log file in folder")))->OnClick.Add([](UI::EventParams &e) {
+			Path logFilePath = g_logManager.GetLogFilePath();
+			if (logFilePath.empty()) {
+				ERROR_LOG(Log::System, "No log file path configured.");
+				return;
+			}
+			if (File::Exists(logFilePath)) {
+				System_ShowFileInFolder(logFilePath);
+			} else {
+				System_LaunchUrl(LaunchUrlType::LOCAL_FILE, logFilePath.NavigateUp().ToString());
+			}
+		});
+	}
 	list->Add(new CheckBox(&g_Config.bLogFrameDrops, dev->T("Log Dropped Frame Statistics")));
 	if (GetGPUBackend() == GPUBackend::VULKAN) {
 		list->Add(new CheckBox(&g_Config.bGpuLogProfiler, dev->T("GPU log profiler")));

UI/NativeApp.cpp

@@ -650,6 +650,7 @@ void NativeInit(int argc, const char *argv[], const char *savegame_dir, const ch
 	}
 
 	if (fileToLog) {
+		// Start logging immediately.
 		g_logManager.EnableOutput(LogOutput::File);
 		g_logManager.SetFileLogPath(Path(fileToLog));
 	} else {