On 5/10/2021 3:54 PM, Gou Lingfeng wrote:

Example: ------ \definetextbackground[undeftext][location=text,alternative=1,dash=3,background=,frame=off,voffset=-.5ex]

\starttext Hello \starttextbackground[undeftext] world! \page

bbb.

\page ccc. \stoptextbackground \stoptext ------

Proposed patch: ------ --- tex/texmf-context/tex/context/base/mkxl/anch-pgr.lmt.bak 2021-05-07 12:19:30.951643997 -0500 +++ tex/texmf-context/tex/context/base/mkxl/anch-pgr.lmt 2021-05-07 12:19:44.716693548 -0500 @@ -123,6 +123,9 @@      local ht    = specification.ht http://specification.ht      local dp    = specification.dp      -- this is not yet r2l ready +-- myfix +realpage=texgetcount("realpageno") +-- end      local w = d.shapes[realpage]      local x, y = getpos()      if trace_ranges then ------

The module-local variable `realpage` is never changed, which is apparently a bug. actually it's something that got lost when the approach was change a bit .. i'll send you another patch to test

Hans ----------------------------------------------------------------- Hans Hagen | PRAGMA ADE Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl -----------------------------------------------------------------