[dot] Inconsistent default margins for png vs. pdf

There seem to be an issue with inconsistent default margins when using dot
to generate "png" vs. "pdf" output. The "png" target appears to have narrow
margins as default (margin=0), where as the "pdf" target has significantly
larger default margins. I'm using Doxygen 1.8.7 and Graphviz 2.38 on
Windows 7.

The wide pdf margins are causing problems with figures taking up
unnecessary much space when using doxygen with dot to generate latex/pdf
documentation.

Could it be possible modify Doxygen to either add a "margin=0;" line to all
generated dot-files, or to provide a "-Fmargin=0" command-line argument to
dot, so that pdf figures becomes as compact as png figures?

Thanks in advance,
Fredrik Orderud

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