Unexpected behaviour about the interaction between the stepper tool and the frontend

[FYL2003]

Unexpected flashing of the stepper tool icon.
Expected behaviour: no flashing occurs (The CSE machine does not have this issue; it might be a useful source for referencing).

Order of execution to trigger the problem:

1. Run the program in stepper tool.
2. Change to Introduction setup.
3. Run the program in the setup.

Figures related to the issue:




(The figures are in the order in which the problem was triggered.)

For detailed behaviour, please check out the video clips attached.

IMG_7710.MOV

[martin-henz]

Thanks for posting this. Same behavior for all §1 and §2 languages: Source and Source Typed.

[RichDom2185]

@leeyi45 could you look into this if you're free? Might/not be related to your refactor recently.

[leeyi45]

Yes this definitely looks like a result of the refactor.

The main issue is that specifically in the case of the subst-visualizer, it sends BEGIN_ALERT_SIDE_CONTENT before the SPAWN_SIDE_CONTENT event is sent. So the END_ALERT_SIDE_CONTENT event doesn't trigger until the next evaluation of any program.

Wrote up a quick fix for this issue, but we definitely need to refactor how the frontend evaluates code.