Fix LayoutBounds calculation

More work is needed for LayoutBoundsSpace

flow.go

@@ -33,10 +33,9 @@ func reflow (
 				size.X, xAlign, lineEnd == len(tokens))
 			
 			// calculate extents
-			lastWordTok  := tokens[lastWord]
-			lastTokenTok := tokens[lastToken]
-			lineMax      := lastWordTok.position.X  + lastWordTok.width
-			lineMaxSpace := lastTokenTok.position.X + lastTokenTok.width
+			lineMax, lineMaxSpace := calculateLineExtents (
+				tokens[lastWord],
+				tokens[lastToken])
 			if lineMax      > minimumSize.X      { minimumSize.X      = lineMax      }
 			if lineMaxSpace > extentsSpace.Max.X { extentsSpace.Max.X = lineMaxSpace }
 		}
@@ -103,6 +102,15 @@ func reflow (
 	return
 }
 
+func calculateLineExtents (lastWord, lastToken token) (lineMax, lineMaxSpace fixed.Int26_6) {
+	if lastWord.kind == tokenKindWord {
+		// the line had a word in it
+		lineMax = lastWord.position.X  + lastWord.width
+	}
+	lineMaxSpace = lastToken.position.X + lastToken.width
+	return lineMax, lineMaxSpace
+}
+
 func alignLinesVertically (tokens []token, height, contentHeight fixed.Int26_6, align Align) {
 	if len(tokens) == 0    { return }
 	if align == AlignStart { return }