Icon sets its minimum size properly

button.go

@@ -69,6 +69,7 @@ func (this *Button) SetIcon (id tomo.Icon) {
 	if this.icon != nil {
 		this.Insert(this.icon, this.label)
 	}
+	this.SetTag("icon", this.icon != nil)
 	this.applyLayout()
 }
 

icon.go

@@ -27,6 +27,9 @@ func NewIcon (icon tomo.Icon, size tomo.IconSize) *Icon {
 
 // SetIcon sets the icon.
 func (this *Icon) SetIcon (icon tomo.Icon, size tomo.IconSize) {
+	iconTexture := icon.Texture(size)
+	bounds := iconTexture.Bounds()
 	this.SetAttr(tomo.AIcon(icon, size))
+	this.SetAttr(tomo.AMinimumSize(bounds.Dx(), bounds.Dy()))
 	this.SetTag(iconSizeString(size), true)
 }