Editor: add formatter support

Change-Id: I65590273b2541e08a39970cd9bb4739a5634b2f7
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/texteditor/texteditor.h

@@ -349,6 +349,8 @@ public:
     virtual void rewrapParagraph();
     virtual void unCommentSelection();
 
+    virtual void autoFormat();
+
     virtual void encourageApply();
 
     virtual void setDisplaySettings(const TextEditor::DisplaySettings &);