[Bug] Matrix children props not updating correctly when referencing other widget

[akaztp]

• Open Stage Control version: 1.8.15
• Operating system: Windows 10
• Open Stage Control options: ?
• Client type: built in
• Session file: bug-session.txt
• Custom module: no

How to reproduce:

• Create "matrix_view" with buttons and props: {"label": "#{(@{matrix_source})[$]}"}
• Create "matrix_source" with buttons.
• Pushing first "matrix_source" button will always display its correct state on the first button of "matrix_view"
• Pushing non-first "matrix_source" buttons will not display its correct state on the corresponding button of "matrix_view". After pushing non-first button, if first button is pushed, all labels in "matrix_view" are updated correctly.

bug-session.txt

Thank you!

[jean-emmanuel]

Could you please provide more information and step by step instructions to reproduce the issue ?

[akaztp]

I've updated the first post. It was a too soon "ENTER" typo...

[jean-emmanuel]

You've hit a limitation with the advanced syntaxes + matrices : to determine whether the props property has changed, OSC evaluates its content with $ equals to 0 and compares it to the last cached result, hence the issue not occurring when pushing the first button (whose index is 0).

To circumvent the issue you can either:

• force the props property to always change whenever it's evaluated by injecting a randomly generated number in it ( what triggers the evaluation is the value updates from matrix_source because of the presence of @{matrix_source}):

  {
  "label": "#{(@{matrix_source})[$]}",
  "_rand": #{Math.random()}
  }

• use the clone matrix pattern as seen in "clone_and_variables.json" from these examples.

[akaztp]

Thanks for your fast and thorough response. I've managed to solve it by adding the props "_forceUpdate": @{matrix-source} instead of the random!

[jean-emmanuel]

Works too ! :)