1660915 - Choosing native dialog when "Save to PDF" is selected on macOS will save an empty file before opening native dialog

Status: RESOLVED DUPLICATE of bug 1660794

(Toolkit :: Printing, defect, P1)

Description

[Erik Nordin [:nordzilla]]

Attachment: example.mov

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Steps To Reproduce

(see attached video)

• Open a web page.
• Open the new print UI.
• Select "Save to PDF" as a printer.
• Click "Print using system dialog..."

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Actual Behavior

• A prompt to save a PDF opens.
• If you click cancel, the native dialog will not open.
• If you click save, then an empty PDF will be saved and the native dialog will open.

Note:

Once you've saved the empty PDF and successfully opened the native dialog, you can close the native dialog and re-open it as expected.

However, switching to a different printer, and then back to "Save as PDF" will force you to save an empty PDF again, before opening the native dialog.

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Expected Behavior

• The native dialog opens with no other effects.

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Misc.

I verified via mozregression that this behavior has existed since the "Save as PDF" option was first made available.

https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=94982363dfa4b5bde758cf1442a9166dc07c16fb&tochange=d6ae04588d3425c058afc56a47ba5345167ea04b