Race condition bug when clicked undo/redo fast

[chuckn0rris]

Forum post

Reproduced on https://bryntum.com/examples/gantt/advanced/
Make few changes to have 6-10 steps undo. As example, create 5 events and make dependencies one by one.
Click undo/redo fast, it will throw an error in console:

Uncaught (in promise) TypeError: Cannot read properties of undefined (reading 'get')
    at _0x305c19.equality (gantt.module.js?454302:13)
    at EngineTransaction.onQuarkCalculationCompleted (gantt.module.js?454302:13)
    at EngineTransaction.calculateTransitionsStackGen (gantt.module.js?454302:13)
    at Generator.next (<anonymous>)
    at EngineTransaction.calculateTransitions (gantt.module.js?454302:13)
    at Generator.next (<anonymous>)
    at runGeneratorAsyncWithEffect (gantt.module.js?454302:13)
    at gantt.module.js?454302:13

[isglass]

Could not reproduce it, asked @chuckn0rris to try. Might have been fixed by other changes

[isglass]

To reproduce:

1. Open advanced demo
2. Click + Create twice
3. Drag create a dependency from the first new tasks end to second ones start
4. Undo twice
5. Redo

[canonic-epicure]

Does not seem to be reproducible anymore in the online examples, probably has been already fixed.

[canonic-epicure]

Please provide new steps to reproduce.

[matsbryntse]

Closed until new repro sequence is available