This covers two scenarios:
1. When a shape is replaced with an expanded subprocess
2. When a subprocess is toggled from collapsed to expanded
Only when:
1. There are incoming sequence flows (previous content)
2. There are no outgoing sequence flows (following content)
* use ES6 import / export
* UTILS: export individual utilities
* TESTS: localize TestHelper includes
BREAKING CHANGE:
* all utilities export independent functions
* library sources got ported to ES6. You must now use
a ES module bundler such as Browserify + babelify or
Webpack to consume this library (or parts of it).