Flow widget collapse button triggers Data Unsaved Warning when moving away from edit page

[arabidopsis]

When a flow collapse/expand button is clicked it marks the data as 'changed' so a triggers 'Prompt'.

Since no data has changed (only the ui layout) this is confusing. See the gif below.

I have a PR I can give you to fix this if you like.

Here is a simple project you can try yourself

Test1.zip

Visual:

[runfalk]

Hey @arabidopsis! We'd very much appreciate a PR for this. It's indeed confusing that collapsing marks the page as edited.

[arabidopsis]

No problem... you might not like it though. I'm a bit stretched for time but I will make a PR soon. Also I
am a react novice... but there seems to be little out there about writing tests for React.