use unit icons in actions of layer oriented sample editor

GUI/Views/SampleDesigner/LayerOrientedSampleEditor.cpp

@@ -56,13 +56,15 @@ LayerOrientedSampleEditor::LayerOrientedSampleEditor(QWidget* parent)
     m_showInlineEditButtonsAction->setChecked(false);
     m_toolbar->addAction(m_showInlineEditButtonsAction);
 
-    m_asAngstromAction = new QAction("A", this); // #baLayerEditor use icon, not text
+    m_asAngstromAction = new QAction(this);
+    m_asAngstromAction->setIcon(QIcon(":/images/unit_angstrom.svg"));
     m_asAngstromAction->setToolTip("Use \303\205ngstrom as unit (where applicable)");
     connect(m_asAngstromAction, &QAction::toggled, this,
             &LayerOrientedSampleEditor::onUnitActionToggled);
     m_asAngstromAction->setCheckable(true);
 
-    auto* asNanometerAction = new QAction("nm", this); // #baLayerEditor use icon, not text
+    auto* asNanometerAction = new QAction(this);
+    asNanometerAction->setIcon(QIcon(":/images/unit_nm.svg"));
     asNanometerAction->setToolTip("Use nanometer as unit (where applicable)");
     connect(asNanometerAction, &QAction::toggled, this,
             &LayerOrientedSampleEditor::onUnitActionToggled);