Avoid using deleted BookmarkTriangles or null BookmarkPopups

BUG: 283753
FIXED-IN: 2.5

src/widgets/BookmarkTriangle.cpp

@@ -44,7 +44,8 @@ BookmarkTriangle::BookmarkTriangle ( QWidget *parent, int milliseconds, QString
 BookmarkTriangle::~BookmarkTriangle()
 {
     DEBUG_BLOCK
-    m_tooltip->deleteLater();
+    if (m_tooltip)
+      m_tooltip->deleteLater();
 }
 
 QSize BookmarkTriangle::sizeHint() const
@@ -119,8 +120,10 @@ void BookmarkTriangle::enterEvent ( QEvent * event )
 
 void BookmarkTriangle::leaveEvent ( QEvent * event )
 {
+    DEBUG_BLOCK
     Q_UNUSED ( event )
-    m_tooltip->displayNeeded(false);
+    if (m_tooltip)
+        m_tooltip->displayNeeded(false);
 }
 
 void BookmarkTriangle::initPopup()

src/widgets/SliderWidget.cpp

@@ -380,10 +380,11 @@ void Amarok::TimeSlider::slotTriangleFocused( int seconds )
 
 void Amarok::TimeSlider::clearTriangles()
 {
-    // DEBUG_BLOCK
-    // debug() << "number of triangles: " << m_triangles.count();
-    qDeleteAll( m_triangles );
-    // debug() << "deleted them all...";
+    DEBUG_BLOCK
+    QList<BookmarkTriangle *>::iterator i;
+    for( i = m_triangles.begin(); i != m_triangles.end(); ++i ){
+      (*i)->deleteLater();
+    }
     m_triangles.clear();
 }