Hello, When a line ends with a sequence whose direction differs from that of the paragraph, we risk pushing some text into the margin (when not necessary). Here is an example with corresponding output:
\usemodule[simplefonts]
\setmainfont[ALM Fixed][features=arabic,range=arabic]
\setupalign[r2l]
\setupwhitespace[big]
\showframe
\starttext
% 10 copies of Persian word "hello" stay on one line.
\dorecurse{10}{سلام }
% 20 copies makes a 2-line paragraph.
\dorecurse{20}{سلام }
% one copy of the word goes into the margin although the Latin letters
perfectly fit the line.
\dorecurse{10}{سلام }
{\textdir TLT\dorecurse{20}{a}}
\dorecurse{10}{سلام }
% although the Latin string extends into the margin, TeX still puts one
copy of "hello" there as well.
\dorecurse{10}{سلام }
{\textdir TLT\dorecurse{30}{a}}
\dorecurse{10}{سلام }
% something similar happens here with the opposite par/text dir
\pardir TLT
\dorecurse{10}{bidi }
{\textdir TRT\dorecurse{20}{آ}}
\dorecurse{10}{bidi }
\stoptext
The problem seems to be that after typesetting the LTR text within the RTL
paragraph, TeX thinks the current text ends at the left end of the LTR
portion; hence, it tries to add something to the line; it's only after that
that it discovers we ran into the margin!
—MHB
bidi-par-bug.pdf
Description: Adobe PDF document
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