For the Switzerland localization, we need to append some extra pages during the PDF generation such as QR barcodes or ISR payment slip.
There were multiple difficulties with the current codes:
- The ir.attachment was generated before the hook allowing to append the extra pages.
- There is no existing hook allowing to get the pages for each invoice when printing on multiple records at once.
This commit aims to dispatch the generation of PDFs from the creating of extra attachments:
- `_render_qweb_pdf_prepare_streams` is called first and creates a stream for each record containing the PDF pages.
- Then, the ir.attachment are generated if necessary.
- Finally, all streams are aggregated together to get the final PDF.
Task: 2726507
Part-of: odoo/odoo#85150
Laurent Smet
7c4e591d58