(Followup to T214797 in respect of a related issue.)
The problem:
The use of paranthesised page numbers such as "(70)" or "(IX)" inside a <pagelist /> tag causes that page number and subsequent page numbers to fail to display when that page numbering is presented in a page built by transcluding those pages.
Example :
https://en.wikisource.org/wiki/The_Return_of_Sherlock_Holmes,_1905_edition/Chapter_3
and
Index:The Return of Sherlock Holmes, edition published in 1905 by McClure, Phillips & Co., New York..djvu
When editing the Index , there is no warning given that "(" and ")" (And potentially other characters) create problems.
Requested feature: Implement an appropriate warning and indication of the problematic characters when an attempt is made to save the relevant Index: page.
A Related task would be an automated script/ search to identify existing Index pages which have parenthesized page numbers, such that they can be amended or replaced.