fix CLineEdit read-only button

PIValueTreeEdit support PIValueTree::Attribute::toolTip

libs/widgets/clineedit.h

@@ -34,14 +34,10 @@ public:
 	~CLineEdit() override;
 
 	const QString & defaultText() const { return dt; }
+	void setReadOnly(bool yes);
 
 public slots:
-	void clearClick() {
-		if (!isEnabled()) return;
-		setText(dt);
-		emit cleared();
-		emit textEdited(dt);
-	}
+	void clearClick();
 	void setDefaultText(const QString & t, bool set_text = false);
 
 signals:
@@ -49,7 +45,7 @@ signals:
 
 private slots:
 	void clearMouseRelease(QMouseEvent * e);
-	void textChangedSlot(QString text);
+	void textChangedInternal();
 
 private:
 	bool eventFilter(QObject * o, QEvent * e) override;