fix: prefill native print dialog options on macOS with OOP printing#50643
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Chromium enabled out-of-process (OOP) printing by default on macOS in https://chromium-review.googlesource.com/c/chromium/src/+/6032774. This broke webContents.print() option prefilling (e.g. copies, collate, duplex) in two ways: 1. ScriptedPrint() silently aborted because RegisterSystemPrintClient() was only called from GetDefaultPrintSettings(), but Electron's flow calls UpdatePrintSettings() instead when options are provided. 2. PrinterQueryOop::UpdatePrintSettings() sends settings to the remote PrintBackend service, but on macOS the native dialog runs in-browser using the local PrintingContextMac::print_info_, which was never updated with the user's requested settings. Fix by registering the system print client in UpdatePrintSettings() and applying cached settings to the local printing context before showing the in-browser system print dialog. Co-authored-by: Shelley Vohr <shelley.vohr@gmail.com>
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codebytere
approved these changes
Apr 2, 2026
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Backport of #50600
See that PR for details.
Notes: Fixed an issue where custom options in
webContents.print()did not prefill the print dialog on macOS.