Prestashop: [BO] JS error in tinymce on "add new supplier" page

[matthieu-rolland]

Describe the bug
When going on the "add a supplier page" (the page with the form to add a supplier), we sometimes have a javascript error related to tinymce.

It's not all the time, I had to refresh the page at least 20 times to reproduce this 😓

This is blocking some automated tests made by the QA team, so this issue should be taken seriously.

Steps to reproduce the behavior:

1. Go to admin-dev/sell/catalog/suppliers/new
2. Check for the error in the console
3. Refresh until you have the error

Screenshots

Additional information
PrestaShop version: 1.7.7.x

[khouloudbelguith]

Same issue with 1.7.7.x

ps1.7.6.3 => OK
Thanks!

[NeOMakinG]

Impossible to debug this since we don't have source files of current tinymce and I was not able to build this version from the official TinyMCE repository, it should wait the upgrade of tinymce which is possibly breaking change for some modules (wdyt @eternoendless @PierreRambaud ?)

[colinegin]

@eternoendless @PierreRambaud any news about @NeOMakinG 's comment ? what should we do ?

[matks]

@eternoendless must tell us whether we can upgrade TinyMCE version in migrated pages . This would create a small BC but would fix a lot of issues related to TinyMCE, and as pages get migrated, this would fix them.

[Progi1984]

@NeOMakinG Could check that #17651 fixes this issue ?

[NeOMakinG]

It looks like #17651 fixed it :)

[NeOMakinG]

Feel free to open it again if you see the error!