message: Add isSameLineThan() to Selection
diff: @@ -111,4 +111,11 @@ class Selection {
  this.start.isEqualTo(selection.start) && this.end.isEqualTo(selection.end)
  );
  }
  +
  + isSameLineThan(selection: Selection): boolean {
  + return (
  + this.start.isSameLineThan(selection.start) &&
  + this.end.isSameLineThan(selection.end)
  + );
  + }
  }
  