[pdftex] pdf/a-1b preflight warning: glyph width info incomplete/inconsistent

[The Thanh Han]

Hi,

I encountered an interesting problem with pdf/a-1b checking:
if a pdf (produced by pdftex) contains a glyph with zero
width (for example, /mapsto from blsy/mtsy), then pdf/a-1b
preflight by Acrobat8 gives warnings about
incomplete/inconsistent width info. From the technical view,
the pdf file seems to be ok: the glyph width in the fontinfo
dict is 0 (read from mtsy.tfm), and from the font program:

,--------
| /mapsto {
|         56 0 hsbw
|         ...
`--------

So the reason seems that when Acrobat sees a zero glyph
width, it treates that width as "missing". Does anyone have
some similar experience with this?

Thanh