Support pdf export with checkboxes #235

[liulex]

But I cannot reproduce this:

for me all checkboxes are visible, but unchecked

Anyway, please test with this patch.

[coveralls]

Coverage decreased (-0.002%) to 2.717% when pulling 6961d99 on liulex:feature/pdf-export-with-checkboxes into 8d7ce82 on pbek:develop.

[pbek]

Thank you for your quick implementation!

For some reason I can only see unchecked checkboxes, the checked ones are not present.

Checkbox Test.pdf

[liulex]

It should be a font issue. Copy this character

and paste it into browser, you will get ☑.

[pbek]

Now, that is funny. I can see them on Manjaro, but not on KDE Neon. Could really be a font issue.

[pbek]

Anyway, great work! I love it!