See https://www.reddit.com/r/bootlegmtg/comments/vvoapc/comment/k562hy8

Idea

Refactor rendering on paper to have actual margins

• The scene size should be reduced by the configured margins
  • Subtract (margin_top*DPI) pixels from all Y coordinates
  • Subtract (margin_left*DPI) pixels from all X coordinates
  • Reduce scene height by margin_top+margin_bottom
  • Reduce scene width by margin_left+margin_right
• The margins should be set in the QPrinter instance, instead of setting them to zero

This should ensure compatibility with printer drivers that refuse zero margins.

A separate printing mode was added that allows the printer to control the margins, which should please those printer drivers and allow to-scale printing.

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This still is an issue with non-A4 paper, even with borderless printing disabled (See user report on reddit)

It is probably required to replace the paper size settings in millimeters with the proper enum-based predefined values.