deduplicate enforcing v>=0

GUI/View/Device/SpanPropertyForm.cpp

@@ -13,6 +13,7 @@
 //  ************************************************************************************************
 
 #include "GUI/View/Device/SpanPropertyForm.h"
+#include "Base/Util/Assert.h"
 #include "GUI/Model/Descriptor/SpanProperty.h"
 #include "GUI/Model/Project/ProjectDocument.h"
 #include "GUI/View/Numeric/DoubleSpinBox.h"
@@ -42,14 +43,10 @@ SpanPropertyForm::SpanPropertyForm(QWidget* parent, const QString& groupTitle,
     m_centerSpinBox = GUI::Util::createDoubleSpinBoxRow(layout, spanProperty->center());
 
     connect(m_widthSpinBox, &DoubleSpinBox::baseValueChanged, [this](double v) {
-	if (v < 0) {
-	    m_spanProperty->setWidth(0);
-	    m_widthSpinBox->updateValue();
-	} else {
-	    if (m_spanProperty->width() == v)
-		return;
-            m_spanProperty->setWidth(v);
-	}
+	ASSERT(v >= 0); // spin box should have got limits from property
+	if (m_spanProperty->width() == v)
+	    return;
+	m_spanProperty->setWidth(v);
 	emit dataChanged();
     });