Trigger core reset when advancing to manual partitioning.

src/modules/partition/gui/PartitionPage.h

@@ -42,11 +42,12 @@ public:
     explicit PartitionPage( PartitionCoreModule* core, QWidget* parent = nullptr );
     ~PartitionPage();
 
+    void onRevertClicked();
+
 private:
     QScopedPointer< Ui_PartitionPage > m_ui;
     PartitionCoreModule* m_core;
     void updateButtons();
-    void onRevertClicked();
     void onNewPartitionTableClicked();
     void onCreateClicked();
     void onEditClicked();

src/modules/partition/gui/PartitionViewStep.cpp

@@ -264,7 +264,11 @@ PartitionViewStep::next()
     if ( m_choicePage == m_widget->currentWidget() )
     {
         if ( m_choicePage->currentChoice() == ChoicePage::Manual )
+        {
             m_widget->setCurrentWidget( m_manualPartitionPage );
+            if ( m_core->isDirty() )
+                m_manualPartitionPage->onRevertClicked();
+        }
         else if ( m_choicePage->currentChoice() == ChoicePage::Erase )
         {
             emit done();