don't mix anchors and layouts

src/declarativeimports/core/iconitem.cpp

@@ -94,6 +94,7 @@ void IconItem::setSource(const QVariant &source)
         if (source.toString().isEmpty()) {
             delete m_svgIcon;
             m_svgIcon = 0;
+            m_loadPixmapTimer.start();
             emit validChanged();
             return;
         }

src/declarativeimports/plasmacomponents/qml/styles/ButtonStyle.qml

@@ -90,8 +90,8 @@ QtQuickControlStyle.ButtonStyle {
             visible: when
             Layout.minimumWidth: units.iconSizes.small
             Layout.maximumWidth: Layout.minimumWidth
+            Layout.alignment: Qt.AlignVCenter
             height: width
-            anchors.verticalCenter: parent.verticalCenter
 
             source: Component {
                 PlasmaCore.SvgItem {