Incorrect fire Print on FF

[KarolDawidziuk]

Type of report

Bug

Provide detailed reproduction steps (if any)

Open editor on FF and click on print button.

Expected result

Preview and print tab should open correctly. No error in the console.

Actual result

Preview are opened correctly but print preview is not available. No errors in the console.

Other details

This happens because FF trying fire print() method before page was fully loaded. We need wait for that.
In the preview plugin we can create some kind of public API to allow adding callback that fired when the preview window is loaded.

• Browser:FF
• OS: macOS, Windows

[KarolDawidziuk]

Blocked by #4444.

[f1ames]

As #4444 is done we can proceed with this one.

[f1ames]

@KarolDawidziuk could you give more details on this one? Following the description (with CKEditor 4 4.16.1 and Firefox 90.0.2) it seems to be working fine. I see no content loss. Maybe some additional condition needs to be fulfilled? 🤔

Preview window:

Print window:

[KarolDawidziuk]

@f1ames It's strange because for me it's not working. There are no additional steps for reproducing it that were not mentioned in #4444. I tested it on macOS and Win7(vBox) and it fails. After #4758 fix preview works but print still not.

[f1ames]

@KarolDawidziuk so if you mentioned #4444 it means it is CDN related too? It's not mentioned anywhere in this ticket or issue description so if that's the case it would be good to update repo steps / description here.