ftoc bug report

another one from the debianites: 
<URL:http://bugs.debian.org/293560>

the submitter gets a syntax error on opening the first pgp-signed
message:

--------------
syntax error in expression "int(1+1+(11-)*(101-1-2)/(101-))"
    while executing
"expr int($minlineno+1+($msgid-$minmsgid)*($maxlineno-$minlineno-2)/($maxmsgid-$minmsgid))"
    (procedure "Ftoc_FindMsg" line 51)
    invoked from within
"Ftoc_FindMsg $msg"
    (procedure "Ftoc_FindMsgs" line 5)
    invoked from within
"Ftoc_FindMsgs $seqids"
    (procedure "Ftoc_ShowSequence" line 21)
    invoked from within
"Ftoc_ShowSequence $seq $msgids"
    (procedure "Ftoc_ShowSequences" line 16)
    invoked from within
"Ftoc_ShowSequences"
    (procedure "FolderChange" line 54)
    invoked from within
"FolderChange privat/az {Msg_Show cur}"
    invoked from within
"time [list  FolderChange $folder $msgShowProc"
    (procedure "Folder_Change" line 3)
    invoked from within
"Folder_Change privat/az"
    (command bound to event)
------------------

looking at the code in question, it seems to me that $minmsgid 
might only be blank if the cache is severly borked.

two questions for the ones who know the innards of exmh better: 
*) would a update-scan-caches operation fix this issue?
*) or is my assumption re the cause of the problem wrong and something
else is broken?

i'm grateful for any infos...
az


-- 
+ Alexander Zangerl + DSA 42BD645D + (RSA 5B586291)
This mind intentionally left blank.

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