On 4/3/2016 9:48 PM, Frank Mittelbach wrote:
Am 11.03.16 um 14:35 schrieb Hans Hagen:
On 3/10/2016 8:56 PM, Frank Mittelbach wrote:
Am 10.03.16 um 20:33 schrieb Hans Hagen:
indeed, this is a known issue and it's on my list to look into that
(one
can check for the location, at least that's what i do as a way out for
now); we probably need an additional callback but not for the next
release (as one might need to adapt code due to a break in
compatibility)
ok good, so much the better if it is already known. yeah one can program
around it, even though it is again a bit painful :-)
indeed and i must admit that when i ran into it long ago that it took me
a while to realize that i needed to ignore those; anyway, i checked what
i had in mind with this ...
... it's pre_box, box, pre_adjust and adjust which are the ones in post
line break and these are not followed by an actual break which happens a
bit later with its own call ...
... i'll move these four to a new callback contribute_filter
(but for now, you'd better check for these 4 cases)
Hi Hans,
looks like the issue is not just resolved by looking for pre_box, box,
pre_adjust and adjust and ignoring those.
If you typeset a \vbox on the main vertical list then one gets 2 calls
to buildpage_filter and both are with context "box". The first one seems
to be the internal one during the actual build of the box and the second
one a real buildpage but claiming the wrong context (or the first one
claims the one context depending on what "box" is supposed to mean.
Above you said you have a workaround checking for "location". Can you
tell me what you mean by this?
I have no time now for a detailed response but the 0.90 version no
longer calls the four troublesome cases but they go their own callback
contribute_filter (called with pre_box (when needed), pre_adjust(when
needed), box (always) and adjust (when needed) and like before just
before the box callback there is an append_to_vlist callback
if you use more than one callback in some solution you still might need
to do some housekeeping but that all depends on what one wants to do
Hans
ps. For those doing things with glue: in recent versions access to glue
properties is possible without messing with glue specs; in the > .90
versions glue specs are completely gone (except as glue register
structure). This makes interfacing from lua somewhat more convenient
(and it's also somewhat more robust).
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