Can't take screenshot of signature pages

[plocket]

It causes an error because taking a screenshot erases the signature. This is technically a bug, but not one that's urgent so I'm going to avoid derailing us by leaving off that label. We can't think of a reason anyone other than us would want to take a screenshot of the signature page. It's going to be documented with SuffolkLITLab/docassemble-AssemblyLine-documentation#212.

More details:

Docassemble currently handles signatures in-house, but hasn't accounted for the page zooming in and out, which clears the drawing in the canvas. When kiln takes a screenshot, it uses the "full page" feature of puppeteer, which seems to zoom out on the page to get the whole thing in the viewport. That causes the signature to be erased.

A potential solution for the future is to take screenshots differently on signature pages [- don't take a full page screenshot]. That might be problematic if developers are trying to find out things about the page that are off-screen, though. An upstream fix is probably necessary, so we might focus on that instead. The code is near the beginning of app.js.

[BryceStevenWilley]

Note; documented in SuffolkLITLab/docassemble-AssemblyLine-documentation#282

[plocket]

Closed by SuffolkLITLab/docassemble-AssemblyLine-documentation#282

[plocket]

Wasn't closed. Not sure why I did that. It was just documented. [Not sure how to get rid of the link to the PR, dangit.]

[plocket]

I think we can deal with this by listening to a window resize or orientationchange, then re-drawing after the event.

[plocket]

Alternatively, when taking a screenshot we can try to determine if it's a signature page and, if so, don't use the 'full screen' option.

[plocket]

Adjusted suffolk documentation to remove warnings about this bug.