improve pagination while printing

[tbussmann]

Avoid widows and orphans, page breaks after headlines (fixes #33)

[antons]

Unfortunately, in our testing on macOS 10.15.4 this technique did not affect pagination in any way.

[tbussmann]

I'm developing on 10.13.6 so I had to set up a VM with 10.15.4 to test. On first view I thought you were right and the change does not work in 10.15. But then I found out, it is the way of testing that leads to false negative results: Pressing cmd-shift-r does reload the template for the preview. While you can switch the developer tools to display and test the @media print styles, it does not allow show a paginated output. For this I used the actual print preview window. Unlike in 10.13, in 10.15 this does however always use the template as it was when the print window was opened for the first time. From then on it uses a cached version and you have to restart iA Writer for the changes to the template to be applied. Knowing that, I ran reconfirm that both the widows/orphans as well as the no-break-after-headline fix do work on 10.15 as they do on 10.13.

[tbussmann]

From then on it uses a cached version and you have to restart iA Writer for the changes to the template to be applied.

An easier way to refresh the print CSS is to switch to another template, briefly open the print window and switch back to the template you are developing on.

[antons]

Thank you for this pull request, and for thoroughly testing it. After more testing, I can confirm it works. I’m not sure what happened the last time we tested it, but we’re very happy that this long-standing problem can be resolved.

In addition to the change proposed in the comment on widows and orphans, I’d appreciate it if you could adjust the commit message with past tense, proper sentence capitalization, and a period at the end, following the style we use in this repo. After that, I‘ll merge the changes.

[antons]

This should probably be applied to p:

.markdown-body p {
  widows: 2;
  orphans: 2;
}