Clear text selection when focus is lost

fixes #409

src/timeline/TimelineItem.cpp

@@ -69,7 +69,6 @@ TextLabel::TextLabel(const QString &text, QWidget *parent)
                 &TextLabel::adjustHeight);
         document()->setDocumentMargin(0);
 
-        setFocusPolicy(Qt::NoFocus);
         setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Fixed);
         setFixedHeight(0);
 
@@ -94,6 +93,16 @@ TextLabel::TextLabel(const QString &text, QWidget *parent)
         });
 }
 
+void
+TextLabel::focusOutEvent(QFocusEvent *e)
+{
+        QTextBrowser::focusOutEvent(e);
+
+        QTextCursor cursor = textCursor();
+        cursor.clearSelection();
+        setTextCursor(cursor);
+}
+
 void
 TextLabel::mousePressEvent(QMouseEvent *e)
 {

src/timeline/TimelineItem.h

@@ -110,6 +110,7 @@ public:
 protected:
         void mousePressEvent(QMouseEvent *e) override;
         void mouseReleaseEvent(QMouseEvent *e) override;
+	void focusOutEvent(QFocusEvent* e) override;
 
 private slots:
         void adjustHeight(const QSizeF &size) { setFixedHeight(size.height()); }