Python: Fix python run configuration

Add the WorkingDirectoryAspect to prevent running the
main script in an unpredictable location.

Change-Id: I1be206261b7983e933b53ccd57c93089154d8417
Reviewed-by: Eike Ziller <eike.ziller@qt.io>
Reviewed-by: Cristian Maureira-Fredes <cristian.maureira-fredes@qt.io>

src/plugins/python/pythonrunconfiguration.cpp

@@ -274,6 +274,7 @@ PythonRunConfiguration::PythonRunConfiguration(Target *target, Core::Id id)
 
     auto argumentsAspect = addAspect<ArgumentsAspect>();
 
+    addAspect<WorkingDirectoryAspect>();
     addAspect<TerminalAspect>();
 
     setCommandLineGetter([this, interpreterAspect, argumentsAspect] {
@@ -305,6 +306,9 @@ void PythonRunConfiguration::updateLanguageServer()
                 PyLSConfigureAssistant::instance()->openDocumentWithPython(python, document);
         }
     }
+
+    aspect<WorkingDirectoryAspect>()->setDefaultWorkingDirectory(
+        Utils::FilePath::fromString(mainScript()).parentDir());
 }
 
 bool PythonRunConfiguration::supportsDebugger() const