The z-order prop diff should be performed on every property value change case (add, delete, add bypass, delete bypass, etc.); previously only checked on add
The z-order prop diff should be performed on every property value change case (add, delete, add bypass, delete bypass, etc.); previously only checked on add

Ref : After removing style with 'display: none', node is not clickable in 3.1 #1859

cytoscape/cytoscape.js,cytoscape/cytoscape.js