Affected versions

• 82.0a1

Affected platforms

• Windows 7

Steps to reproduce

1. Launch Firefox
2. Make sure print.tab_modal.enabled is set on true
3. Open any page
4. Click on More settings
5. Select Minimum option from Margins dropdown

Expected result

• Minimum option is set, the print preview adjust accordingly, the label is displayed as Minimum

Actual result

• Minimum option is set, the print preview adjust accordingly, but the label remains the Default one

Regression range

• First bad: 603459fd7f347a9f5b2fb9dc52ab058188dd48d8
• Last good: 0f3afede4904a0df99f016c03dd552053560ef1b
• Pushlog: https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=0f3afede4904a
  0df99f016c03dd552053560ef1b&tochange=603459fd7f347a9f5b2fb9dc52ab058188dd48d8

Additional notes

• None is not affected by this behavior

Suggested severity

• S4 since affects only Windows 7 and the functionality is not broken

This sounds like a duplicate of bug 1662699…

Since the marges directly from the paper and the default settings margin can return slightly
different numbers (off by .0001), we need to round in order to correctly return the minimum
value and allow the user to switch from the default preset.

(In reply to Emma Malysz from comment #2)

Since the marges directly from the paper and the default settings margin can return slightly
different numbers (off by .0001), we need to round in order to correctly return the minimum
value and allow the user to switch from the default preset.

Sounds like this may fix bug 1660520?

https://hg.mozilla.org/mozilla-central/rev/a98fd1750fe8

Confirming this issue no longer reproduces on Windows 7x64 using 82.0-build1, with the print.tab_modal.enabled pref set to true.