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Diffstat (limited to 'doc/expert/pre_head')
| -rw-r--r-- | doc/expert/pre_head | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/doc/expert/pre_head b/doc/expert/pre_head index 14e2871..e8779aa 100644 --- a/doc/expert/pre_head +++ b/doc/expert/pre_head @@ -110,4 +110,15 @@ terminated by the start of the range of the next. All four symbols yield the value @@Null where they appear. If they do not occupy entire components of their galley, they are silently ignored. +@PP +Owing to limitations in the way header components are implemented, the +following object types are not allowed inside them, and Basser Lout will +complain and quit if it finds any of them: galleys, receptive or +recursive symbols, cross references, @@PageLabel, @@HExpand, @@VExpand, +@@HCover, @@VCover, and @@Scale when it has an empty left parameter. +In addition, if more than three copies of the same running header are +printed on the same page, their horizontal positions will become +confused, probably resulting in the apparent disappearance of all but the +last three copies. (The magic number 3 can be increased by recompiling +the Lout source with the @F MAX_HCOPIES constant increased.) @End @Section |