Fix custom page size handling in the Unix print dialog

There were several problems that i've fixed in a single commit since they are very interwinded

 * The dialog used QPageSize::Custom for two things, the custom sizes coming from
   the printer and the "user can write whatever size they want" size. Now only
   the printer custom sizes use QPageSize::Custom and we use m_realCustomPageSizeIndex
   for the "user can write whatever size they want" one.

 * The dialog stored the QPageSize id as the combo userData, that doesn't work
   when the printer has multiple custom sizes since they all share QPageSize::Custom
   so now it stores the QPageSize itself

Task-number: QTBUG-58733
Change-Id: Ie640a07bb5e24b753db83c091c836e8af4ff126c
Reviewed-by: Andy Shaw <andy.shaw@qt.io>

0 files changed, 0 insertions, 0 deletions