BIDI question

[Dmitry Antipov <dmantipov@yandex.ru>]

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There is a text with a mix of Arabic and ASCII characters (attached), and it is
displayed correctly (first screenshot a.k.a top.png). But, when I concatenate
this text with itself (cat /tmp/uthmani.txt /tmp/uthmani.txt > 1.txt) and view
the result, second Arabic fragment is rendered L2R (second screenshot a.k.a
next.png). Why it is different from the first Arabic fragment, and isn't it a bug?

Dmitry

[-- Attachment #2: uthmani.txt --]
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بِسْمِ ٱللَّهِ ٱلرَّحْمَٰنِ ٱلرَّحِيمِ تَبَّتْ يَدَآ أَبِى لَهَبٍۢ وَتَبَّ
مَآ أَغْنَىٰ عَنْهُ مَالُهُۥ وَمَا كَسَبَ
سَيَصْلَىٰ نَارًۭا ذَاتَ لَهَبٍۢ
وَٱمْرَأَتُهُۥ حَمَّالَةَ ٱلْحَطَبِ
فِى جِيدِهَا حَبْلٌۭ مِّن مَّسَدٍۭ
بِسْمِ ٱللَّهِ ٱلرَّحْمَٰنِ ٱلرَّحِيمِ قُلْ هُوَ ٱللَّهُ أَحَدٌ
ٱللَّهُ ٱلصَّمَدُ
لَمْ يَلِدْ وَلَمْ يُولَدْ
وَلَمْ يَكُن لَّهُۥ كُفُوًا أَحَدٌۢ
بِسْمِ ٱللَّهِ ٱلرَّحْمَٰنِ ٱلرَّحِيمِ قُلْ أَعُوذُ بِرَبِّ ٱلْفَلَقِ
مِن شَرِّ مَا خَلَقَ
وَمِن شَرِّ غَاسِقٍ إِذَا وَقَبَ
وَمِن شَرِّ ٱلنَّفَّٰثَٰتِ فِى ٱلْعُقَدِ
وَمِن شَرِّ حَاسِدٍ إِذَا حَسَدَ
بِسْمِ ٱللَّهِ ٱلرَّحْمَٰنِ ٱلرَّحِيمِ قُلْ أَعُوذُ بِرَبِّ ٱلنَّاسِ
مَلِكِ ٱلنَّاسِ
إِلَٰهِ ٱلنَّاسِ
مِن شَرِّ ٱلْوَسْوَاسِ ٱلْخَنَّاسِ
ٱلَّذِى يُوَسْوِسُ فِى صُدُورِ ٱلنَّاسِ
مِنَ ٱلْجِنَّةِ وَٱلنَّاسِ


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[-- Attachment #4: next.png --]
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