[GUI] Remove code for Qt < 5.9

src/Gui/iisTaskPanel/src/iisiconlabel.cpp

@@ -127,11 +127,7 @@ void iisIconLabel::paintEvent ( QPaintEvent * event )
         QRect boundingRect;
 
         QFontMetrics fm(fnt);
-#if QT_VERSION >= 0x040203
         QString txt(fm.elidedText(myText, Qt::ElideRight, textRect.width()));
-#else
-        QString txt = myText;
-#endif
 
         p.drawText(textRect, Qt::AlignLeft | Qt::AlignVCenter, txt, &boundingRect);
 

src/Gui/iisTaskPanel/src/iistaskbox.cpp

@@ -77,11 +77,7 @@ void iisTaskBox::showHide()
 	if (m_foldStep)
 		return;
 
-#if QT_VERSION >= 0x050000
 	m_foldPixmap = myGroup->grab(myGroup->rect());
-#else
-	m_foldPixmap = QPixmap::grabWidget(myGroup, myGroup->rect());
-#endif
 
 	if (myGroup->isVisible()) {
 		m_tempHeight = m_fullHeight = myGroup->height();
@@ -158,12 +154,10 @@ void iisTaskBox::paintEvent ( QPaintEvent * event )
 	QPainter p(this);
 
 	if (myDummy->isVisible()) {
-#if QT_VERSION >= 0x040202
 		if (m_foldDirection < 0)
 			p.setOpacity((double)m_foldStep / myScheme->groupFoldSteps);
 		else
 			p.setOpacity((double)(myScheme->groupFoldSteps-m_foldStep) / myScheme->groupFoldSteps);
-#endif
 
 		p.drawPixmap(myDummy->x(),myDummy->y(),m_foldPixmap);
 

src/Gui/iisTaskPanel/src/iistaskheader.cpp

@@ -100,10 +100,8 @@ void iisTaskHeader::paintEvent ( QPaintEvent * event )
     Q_UNUSED(event);
     QPainter p(this);
 
-#if QT_VERSION >= 0x040203
     if (myScheme->headerAnimation)
         p.setOpacity(m_opacity+0.7);
-#endif
 
     p.setPen(myScheme->headerBorder);
     p.setBrush(myScheme->headerBackground);