matter.js

132888ae - Implement new "fieldName$Changing" event (#842)

Implement new "fieldName$Changing" event (#842) * Implement new "fieldName$Changing" event - Transaction commit now supports a "pre-commit" phase that executes before phase-1 commit - Adds attribute$Changing events to Behaviors that emit in transaction pre-commit - $Changing events allow for state mutation and will cycle for a limited number of times until state is stable - Datasource.reference will now always returns the same managed value for a supervisor session - Observable.isObserved allows for emitter optimization if an Observable has no observers - Adds isObserved to ObservableProxy and moves into Observable.ts - Fixes the floating promise in FailsafeTimer; it tended to kill a test run without an easy way to identify the cause - Adds "deep copy" functionality for cloning an object. Support circular references and data views - Includes a bunch of new tests for $Changing events * Update CHANGELOG.md --------- Co-authored-by: Ingo Fischer <github@fischer-ka.de>