Nyall Dawson 0cccf4c42b Support CSS margins for block elements in HTML labels
Adds support for CSS margin properties for block elements in
the text renderer. Specifically:

- This is available for block type elements only, eg DIV, P, H1-H6.
- Margins are NOT available for spans or other non-block content (due to Qt
  limitations)
- Margins can be specified in pt units only
- Margins can be specified either via "margin-left: 5pt; margin-right:
  10pt" etc, or "margin: 5pt 0pt 10pt 0pt"
- Negative margins are supported for the bottom margin ONLY (due to Qt
  limitations)
2024-11-10 09:51:55 +11:00
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