Hide some diff editor controls when diff editor is bound to a file.

Remove unnecessary anymore "ignoreWhitespace" argument
from functions which read a patch file.

Transfer the ownership of reloader into controller.

Task-number: QTCREATORBUG-13250
Change-Id: I68183005b845d6ece9ea2be9888abc8597310426
Reviewed-by: Tobias Hunger <tobias.hunger@theqtcompany.com>

src/plugins/diffeditor/diffeditor.h

@@ -104,6 +104,9 @@ private:
     DiffEditorGuiController *m_guiController;
     QToolBar *m_toolBar;
     QComboBox *m_entriesComboBox;
+    QAction *m_whitespaceButtonAction;
+    QAction *m_contextLabelAction;
+    QAction *m_contextSpinBoxAction;
     QAction *m_toggleDescriptionAction;
     QAction *m_reloadAction;
     QToolButton *m_diffEditorSwitcher;