TextLayoutMetrics constructor Null safety

1. Flutter
2. services
3. TextLayoutMetrics
4. TextLayoutMetrics constructor

TextLayoutMetrics class

1. Constructors
2. TextLayoutMetrics
3. Properties
4. hashCode
5. runtimeType
6. Methods
7. getLineAtOffset
8. getTextPositionAbove
9. getTextPositionBelow
10. getWordBoundary
11. noSuchMethod
12. toString
13. Operators
14. operator ==
15. Static methods
16. isWhitespace