Test 1 - foreignObject content change in flex:
  SVG width unchanged: true
  SVG height unchanged: true
  Sibling width unchanged: true
  Sibling x unchanged: true
Test 2 - SVG child element change in flex:
  SVG width unchanged: true
  SVG height unchanged: true
  Sibling width unchanged: true
  Sibling x unchanged: true
Test 3 - SVG root width attribute change in flex:
  SVG width changed to 200: true
  Sibling width decreased: true
Test 4 - Nested SVG inner content change in flex:
  Outer SVG width unchanged: true
  Outer SVG height unchanged: true
  Sibling width unchanged: true
  Sibling x unchanged: true