ekklesiaandClaude Opus 5.5
10433b850d
Little Waders, 0.2.2: SIGSEGV in QPrinter::resolution() every time a teacher confirmed a print job. QWebEngineView.print() keeps the raw QPrinter pointer and returns; Qt's didPrintPage() reads printer->resolution() once Chromium has rendered the page, and by then PyQt had deleted the printer, which print_view() held only as a local. Reproduced in the lab with the 0.2.2 code, same backtrace, no job. Keeping the printer alive fixed the crash and was measured, and Qt's path was still not a print path: a worksheet PDF tab printed as one blank page, a lesson went as 24.6 MB of 300 dpi pictures with no text, and a queue refusing jobs was reported as printed. Print is now: make a PDF (a worksheet already is one; a lesson page is printToPdf'd onto the printer's own paper; an inline PDF is downloaded and opened as a worksheet), show it in a preview with printer, pages, copies and colour, and hand it to CUPS with lp — Chrome's route in the same rooms. Nothing asynchronous holds a printer. Black and white uses the driver's ColorModel=Grayscale, because Elmer's generic PCL 6 driver ignores print-color-mode. An exception escaping any slot no longer aborts Wonder Ink: PyQt6's default is to kill the process, and it is now logged instead. tests/test-classroom-printing.sh: 50 checks. tools/lab/wonderink-print- check: 39 checks over 13 scenarios in the lab, against a queue built from Elmer's PPD, judged by what CUPS received. Not yet on paper. Co-Authored-By: Claude Opus 5.5 <[email protected]>