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/diffeditormanager.h

@@ -53,6 +53,7 @@ public:
 
     static DiffEditorDocument *find(const QString &documentId);
     static DiffEditorDocument *findOrCreate(const QString &documentId, const QString &displayName);
+    static void removeDocument(DiffEditorDocument *document);
 
 private slots:
     void slotEditorsClosed(const QList<Core::IEditor *> &editors);