An issue regarding editors and Firefox has been found with LWS enabled with Bryntum 5.2.10 version, where start cell editing event is not triggered and the handler is not called.
We could reproduce the issue with a new isolated grid component.
Steps to recreate: Start editing any cell and notice that handler isn't called.
We were not able to reproduce this error on any other browser, also, no relevant error seems to be reported in the developer console.
Hi Alex, thanks for continued prompt support and patience.
May I confirm that you are running the code with all three conditions matched?
You are running on Salesforce Platform
LWS (Lightning Web Security) is enabled on your org
The browser is Firefox
By the looks of it, and I might be wrong, you are confirming from the standalone bryntum examples, which are independent of Salesforce platform, and the events are working fine in all cases except when all three above mentioned conditions are matched.
So, standalone examples will work fine in browser environment.
LWS (Lightning Web Security) is enabled on your org
Officially we do not support LWS, we plan to introduce that later.
After I enabled LWS with version 5.3.1, I see another and more critical issues. I've opened ticket for those issues to fix it. When it will be fixed, we can return to this problem with event triggering and check if we can fix that moment before official LWS support release.