src/rxvtfont.C ascent/descent and g.xOff patch

[clutton]

Hi list.

I was trying to fix enormous font width for urxvt running on FreeBSD.
The fonts I have are «Monaco» and «PragmataPro».

Perhaps you all know that patch. Even Arch Linux FAQ mentioned it.
But the patch doesn't resolve a missing unicode chars borrowing logic.
I mean rxvt_font_xft::has_char doesn't work as expected after that
patch.

The method a little tricky buy the way :), it requires a good
understanding the domain.

I wish I had the same fond width for rxvt like mate-terminal, xterm, etc
do have.
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