Work around Fontforge underline position bug.

Specifically, when you call generate(), it helpfully adjusts the underline
position by subtracting the underline line width. This means the underline
position for the generated font is lower than the underline position in the
original font, potentially low enough to push it into the next line of text.
This causes weird rendering glitches in (at least) Konsole when displaying
underlined text.

ligaturize.py

@@ -210,6 +210,9 @@ change_font_names(font, output_font['fontname'],
                         output_font['copyright_add'],
                         output_font['unique_id'])
 
+# Work around a bug in Fontforge where the underline height is subtracted from
+# the underline width when you call generate().
+font.upos += font.uwidth
 
 # Generate font & move to output directory
 output_name = output_font['filename']