Editor: Highlight automatically inserted text

Keep the highlight as long as the cursor is directly behind the closing
character and the editor is the focus widget.

Change-Id: Ic1d4bac263e9d2f395791dad7ecdceb9d69635c5
Reviewed-by: Alessandro Portale <alessandro.portale@qt.io>

src/plugins/texteditor/texteditor.h

@@ -301,6 +301,7 @@ public:
     static Core::Id SnippetPlaceholderSelection;
     static Core::Id CurrentLineSelection;
     static Core::Id ParenthesesMatchingSelection;
+    static Core::Id AutoCompleteSelection;
     static Core::Id CodeWarningsSelection;
     static Core::Id CodeSemanticsSelection;
     static Core::Id UndefinedSymbolSelection;
@@ -323,6 +324,9 @@ public:
     enum Side { Left, Right };
     void insertExtraToolBarWidget(Side side, QWidget *widget);
 
+    // keep the auto completion even if the focus is lost
+    void keepAutoCompletionHighlight(bool keepHighlight);
+
     virtual void copy();
     virtual void paste();
     virtual void cut();