[Bug]: Group with clipPath and children with shadow render error

[byeval]

CheckList

• I agree to follow this project's Code of Conduct
• I have read and followed the Contributing Guide
• I have read and followed the Issue Tracker Guide
• I have searched and referenced existing issues and discussions
• I am filing a BUG report.
• I have managed to reproduce the bug after upgrading to the latest version
• I have created an accurate and minimal reproduction

Version

6.0.2

In What environments are you experiencing the problem?

Chrome

Node Version (if applicable)

None

Link To Reproduction

https://codesandbox.io/p/sandbox/group-clippath-with-children-has-shadow-xplly3?file=%2Fsrc%2Findex.js%3A39%2C1&workspaceId=bc31a0d2-b26d-4ab3-b184-2d719079ef42

Steps To Reproduce

1. create a rect with shadow as group background
2. group add a clipPath
3. render and get error

Expected Behavior

render correctly without error

Actual Behavior

render error and crashed

Error Message & Stack Trace

TypeError
Cannot read properties of undefined (reading 'forEach')
Mr.createClipPathLayer
https://xplly3.csb.app/node_modules/fabric/dist/index.min.js:1:70862
Mr._drawClipPath
https://xplly3.csb.app/node_modules/fabric/dist/index.min.js:1:71135
Mr.drawObject
https://xplly3.csb.app/node_modules/fabric/dist/index.min.js:1:117783
Mr.render
https://xplly3.csb.app/node_modules/fabric/dist/index.min.js:1:69247
Mr.render
https://xplly3.csb.app/node_modules/fabric/dist/index.min.js:1:118096
Cn._renderObjects
https://xplly3.csb.app/node_modules/fabric/dist/index.min.js:1:32024
Cn.renderCanvas
https://xplly3.csb.app/node_modules/fabric/dist/index.min.js:1:31275
Cn.renderAll
https://xplly3.csb.app/node_modules/fabric/dist/index.min.js:1:133748

[asturur]

Thanks for the bug report.
Must have to be something related the recent clipPath changes.

[asturur]

I checked this yesterday and i couldn't plan a quick fix.
I have to verify how rendering works when a group has a clipPath but is not caching, because i don't remember how does it do.

[byeval]

Hi @asturur, thanks for your reply! I'm trying to read fabric source code to see if I can contribute too.

[byeval]

Sorry, I don't have enough time to address this issue, I have read parts of the code, i don't understand what willDrawShadow do, if I just comment it, it seems worked.

[asturur]

Yes because if you comment willDrawShadow the group will be cached normally and everything works.
The shadow of a child wll break caching on purpose ( probably a dumb feature but it is what it is ).
This needs to be fixed

[byeval]

Thank you for your explanation. I will try to read more source code later.