Brackets are not handled correctly with mixed English/Latin and Hebrew/Arabic texts

[noseeba Al kindi]

Dear,

I am interested in solving this bug [56408]:

https://bugs.documentfoundation.org/show_bug.cgi?id=56408

when i go through the classes there was part talking about single and
multi portion that I didn't understand it, so if anyone could explain
what is a portion exactly? and what is the the different between
single and multi portion?

BTW, I welcome any suggestion that could help in solving this issue.

regards
Nusaiba