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Print to PDF used to name the file with the email's Subject: line, but now it defaults to "Untitled".

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I'm on an old MacBook, running an admittedly old version of MacOS (but still claimed to be supported by Thunderbird). When I do File->Print->Save as PDF..., Thunderbird 68 and earlier would put the content of the Subject: line in the Save As: field of the Print dialogue. In Thunderbird 78, it defaults to "Untitled.pdf", and unless I remember to do it first, I have to cancel the printing so I can copy the Subject line to paste it into the Save As: field.

Is this a deliberate regression? Is there some setting to get it back? Or should I file a bug?

Thanks.

I'm on an old MacBook, running an admittedly old version of MacOS (but still claimed to be supported by Thunderbird). When I do File->Print->Save as PDF..., Thunderbird 68 and earlier would put the content of the Subject: line in the Save As: field of the Print dialogue. In Thunderbird 78, it defaults to "Untitled.pdf", and unless I remember to do it first, I have to cancel the printing so I can copy the Subject line to paste it into the Save As: field. Is this a deliberate regression? Is there some setting to get it back? Or should I file a bug? Thanks.

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When you save a message as a pdf from the Print command, the process is handled by whatever pdf printer driver is applied by the operating system. Windows 10 has a built-in pdf printer driver, and other versions can use 3rd-party drivers, so I expect it is similar with OS X. To export messages in pdf format and have the file name the same as the Subject, use ImportExportTools NG (right-click, Save selected messages, PDF format).

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So I have to load an add-on to get a feature that used to be part of Thunderbird? This seems sub-optimal. I guess I'll have to file a bug.

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Chosen Solution

Looks like somebody beat me to it. See https://bugzilla.mozilla.org/show_bug.cgi?id=1668515

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As mentioned in the bug, the W10 Print to PDF is also deficient in that it leaves the file name blank in the Print dialog. The add-on works fine here in TB 78/W10.

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I'm not interested in the add-on. This is a regression in TB's behavior on MacOS. I don't know if it's a regression in its behavior on Windows, because I don't know if TB 68 pre-populated the Microsoft "Print to PDF" dialog with the contents of the Subject: line. I have a simple workaround (which my muscle memory now knows), so I can wait for the bug to be fixed.