Collapsing/Expanding sometimes visually not happening when the Gantt has a fixed height

[FilipeCosta06]

Expected behaviour

Collapsing and expanding should hide/show data.

Actual behaviour

When setting a fixed height, some combinations of collapse/expands don't visually update the Gantt.

Live demo with steps to reproduce

https://jsfiddle.net/g6t8yh0r/1/
This demo is just the official subtask demo. I removed the title and added a fixed height of 300.

To reproduce, in this example:

• first, click on "Design" (works OK)
• then, click on "Planning" (visually, nothing happens)
• finally, click on "Develop" (this will cause both this Tick and Planning to collapse)

And some similar issues happen when trying to expand.

I thought simply calling chart.redraw() or chart.update({}) would fix it but it didn't.

Product version

Product: Highcharts Gantt v7.2.0

Affected browser(s)

Chrome, but I assume any other too.

[pawelfus]

Thanks for reporting @FilipeCosta06

@jon-a-nygaard - could you take a look?

[jon-a-nygaard]

Thanks again for reporting. This is obviously a bug, and me or one of the other developers will start working on a solution as soon as possible.

[sebastianbochan]

Internal note:
Related with #11742

[amitlivnat]

Hey guys,
Any update on this one? I have few clients' complaints about it and need to know how to answer to them.
Please advise.
Thanks.
Amit

[pawelfus]

Hi @amitlivnat
No updates at this moment, but issue is prioritized.