Qt 5.12 deprecation fixes (#1003)

src/lib_gui/qt/project_wizard/content/path/QtProjectWizardContentPathPythonEnvironment.cpp

@@ -63,12 +63,13 @@ void QtProjectWizardContentPathPythonEnvironment::onTextChanged(const QString& t
 		m_resultLabel->setText("Checking validity of Python environment...");
 		std::thread([=]() {
 			std::pair<int, std::string> out = utility::executeProcess(
-				"\"" + ResourcePaths::getPythonPath().str() +
-					"SourcetrailPythonIndexer\" check-environment " + "--environment-path \"" +
-					utility::getExpandedAndAbsolutePath(
+				ResourcePaths::getPythonPath().wstr().append(L"SourcetrailPythonIndexer"),
+				std::vector<std::wstring>{
+						L"check-environment",
+						L"--environment-path " + utility::getExpandedAndAbsolutePath(
 						FilePath(text.toStdWString()), m_settings->getProjectDirectoryPath())
-						.str() +
-					"\"",
+						.wstr()
+						},
 				FilePath(),
 				5000);
 			m_onQtThread([=]() {