.csv output broken - output all rows instead of just visible ones

[kugra-al]

.xlsx works

It's trying to output all 170+ fields instead of only the visible ones. Probably hitting URL length. Only visible columns should be exported.

Print also broken (uses all allocated memory) - likely same issue. There is something somewhere about hiding non-visible cols from exports, just need to find it again.

[kugra-al]

yajra/laravel-datatables#1558

yajra/laravel-datatables-buttons#78

yajra/laravel-datatables-buttons#78 (comment)

Need to use POST for export methods instead of GET to expose getVisibleColumns. So postExcelVisibleColumns instead of adding buttons in html. Just need to find where that is...

Ed: is here - https://github.com/yajra/laravel-datatables-buttons/blob/8bdd20623bfd21dcb586b916e22132ec9bb2907d/src/resources/assets/buttons.server-side.js#L120 - but where to put? Can't extend, unknown button type