func (p *Part) DepthMatchFirst(matcher PartMatcher) *Part {
	root := p
	for {
		if matcher(p) {
			return p
		}
		c := p.FirstChild
		if c != nil {
			p = c
		} else {
			for p.NextSibling == nil {
				if p == root {
					return nil
				}
				p = p.Parent
			}
			p = p.NextSibling
		}
	}
}
func (p *Part) DepthMatchFirst(matcher PartMatcher) *Part {
	root := p
	for {
		if matcher(p) {
			return p
		}
		c := p.FirstChild
		if c != nil {
			p = c
		} else {
			for p.NextSibling == nil {
				if p == root {
					return nil
				}
				p = p.Parent
			}
			p = p.NextSibling
		}
	}
}
func ( p * Part ) DepthMatchFirst ( matcher PartMatcher ) * Part { root := p for { if matcher ( p ) { return p } c := p . FirstChild if c != nil { p = c } else { for p . NextSibling == nil { if p == root { return nil } p = p . Parent } p = p . NextSibling } } }
// DepthMatchFirst performs a depth first search of the Part tree and returns the first part that
// causes the given matcher to return true
DepthMatchFirst performs a depth first search of the Part tree and returns the first part that causes the given matcher to return true