v0.2.25

⚠️ Important notes

• pyHanko is no longer installed with xhtml2pdf. Signing a PDF needs the
  signing extra, which all includes: pip install xhtml2pdf[all]
  installs what a plain install did before. Without it, asking
  for a signature raises an ImportError that names the extra, rather
  than writing an unsigned PDF. Fixes :issue:809 and :issue:755.

🎉 New

• -pdf-frame-pages: last paints a Static Frame on the last page only,
  and not-last on every page but the last: a signature block or a
  closing footer at the end of a document of any length. See
  :doc:format_html. Fixes :issue:105.
• -pdf-frame-align: bottom puts a block at the bottom of the page it
  lands on, and moves it whole to the bottom of the next page when it does
  not fit: a signature at the foot of the last page. See
  :doc:format_html. Fixes :issue:429.
• <pdf:resetpagenumber value="1"/> starts the page numbering again on
  the page it falls on, for the headers and footers, <pdf:pagenumber>
  in the flow and the table of contents. Fixes :issue:461.

🐛 Bug-Fixes

• Conversions in different threads of a process no longer swap fonts. Two
  documents converted at once could come out with the bold or italic of a
  family missing, or drawn with another document's file, with no error.
  A process now converts one document at a time; see the Python API
  reference for converting in parallel with processes.
• Two documents that name a font-family the same and embed different
  files each draw with their own, also one after the other. The second used
  to be drawn with the first one's file, with a warning.
• Every image is drawn with its own pixels again. Since 0.2.23 a document
  with several PNGs (or GIFs, or any image other than a JPEG) drew each of
  them as the first one: a logo and two charts came out as three logos.
  Fixes :issue:848.
• An inline element with padding or a border right after a <br/> no
  longer fails the render with IndexError: string index out of range
  when its text starts with whitespace, such as  . Fixes
  :issue:849.
• A non-breaking space at the start of a line after a <br/> is kept,
  as a browser keeps it: <br/>&#xa0;&#xa0;text is indented by two
  spaces, not one.
• The top and bottom margins of a <div> (or any block without padding,
  a border or a background) are kept when what it holds are paragraphs or
  other blocks with margins of their own. The block's margin goes above its
  first child and below its last, collapsing with theirs to the larger one
  as in a browser; a <div style="margin-bottom: 1in"> around a
  <p style="margin: 0"> used to leave no room at all. Text directly
  inside such a block no longer repeats the block's margins above and below
  every paragraph of it, and a block's vertical margins are no longer
  inherited by the blocks inside it. Fixes :issue:310.
• <pdf:pagecount> written in the flow, outside a static frame, shows
  the number of pages of the document. On the pages laid out before the
  last one it showed how many pages there were so far: Page 1 of 1 on
  the first page of two.
• padding on <body> or <html> is room around the page content,
  given once: the sides indent every block and the tables in the flow, the
  top is room above the first block. Every paragraph used to draw it again,
  so a body with padding: 20px spread its lines down the page. Fixes
  :issue:728.
• A <canvas type="graph"> chart takes the margins and the padding of
  the block around it, its own margins when it is display: block, and
  the text-align of its block: text-align: center centres it. It was
  always put at the left edge, flush against what came before and after.
  Fixes :issue:693.
• width on a <div>, a <p> or any other block is applied: a
  length, or a percentage of the block that contains it, as the width of
  its content box. margin: 0 auto centres the block and
  margin-left: auto puts it on the right. A block always took the whole
  width of the frame. Fixes :issue:545.

| Thanks to the following people on GitHub for contributing to this release:
| cristianchiriac, who fixed the IndexError after a <br/>
(:pr:850), rondanen, whose report of the repeated PNG found its
cause, and wyhsu1128, who narrowed the <br/> crash down to a few
lines of HTML.

Full Changelog: v0.2.24...v0.2.25