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On 2018-08-30T13:54:06+00:00 Miikka-Markus Alhonen wrote:

Description:
Arabic is sometimes written with diacritical vowel marks, which are placed 
either above or below each letter of the word. Many multipurpose fonts, which 
are not designed specifically for Arabic, place some of these marks in the 
empty space between lines, outside of the space reserved for line height. 
Writing Arabic in LibreOffice Writer, these marks don't become visible while 
typing but only after the page view has changed once.

See the attached series of screenshots, where the first screenshot has
been taken while typing. The first letter of the first word (reading
from right to left) should have two diacritical marks: ء and a diagonal
line above the letter: أَ. Only the lower half of the ء mark is visible
and the diagonal line not at all. The second letter of the same word has
a circle on top of it but only the lower half of it is visible. Equally
so for the third word of the sentence بِبَرْنَامِجِ, where the last
letter of the word has a diagonal line below, but it is not visible at
all. The second screenshot has been taken after I scrolled the page down
by a couple of screens and then scrolled back. Now all the diacritics
are shown as they should. In the third screenshot I have deleted all of
the text I typed but as you can see, some parts of the diacritics are
still visible above the line. If I scroll down and back, they would
disappear. If you want to test it yourself, the sentence I wrote reads
"أَكْتُبُ هُنَا بِبَرْنَامِجِ لِيبَرْ أُفِيسْ".

This problem is similar to
https://bugs.documentfoundation.org/show_bug.cgi?id=85426 but does not
involve fixing line spaces. Even the font I'm using is different (DejaVu
Sans).

This bug was first reported on Launchpad for LO 5.4.6.2 on Ubuntu 17.10
at: https://bugs.launchpad.net/ubuntu/+source/libreoffice/+bug/1772451 .
After my initial report, I have upgraded to LO 6.0.3.2 and can still
reproduce the problem. On Launchpad, I was advised to file this report
separately from 85426, as I was not sure whether it is exactly the same
issue or just related to it.

Steps to Reproduce:
1. Type Arabic text with full vowel marks, including low diacritics under 
letters extending below the baseline and high diacritics on top of high letters.
2. Remove the text by pressing backspace.

Actual Results:
Many vowel diacritics or parts of them become visible only after the view is 
changed, and removing a character sometimes leaves the diacritic or part of it 
visible on the screen, although textually it doesn't exist anymore.

Expected Results:
All diacritics should become visible as the user is typing and be removed from 
the screen as soon as the characters are removed.


Reproducible: Always


User Profile Reset: No


Additional Info:

Reply at:
https://bugs.launchpad.net/ubuntu/+source/libreoffice/+bug/1772451/comments/7

------------------------------------------------------------------------
On 2018-08-30T13:55:34+00:00 Miikka-Markus Alhonen wrote:

Created attachment 144556
Writer view as the user is typing

Reply at:
https://bugs.launchpad.net/ubuntu/+source/libreoffice/+bug/1772451/comments/8

------------------------------------------------------------------------
On 2018-08-30T13:56:23+00:00 Miikka-Markus Alhonen wrote:

Created attachment 144557
Writer view after the screen has changed

Reply at:
https://bugs.launchpad.net/ubuntu/+source/libreoffice/+bug/1772451/comments/9

------------------------------------------------------------------------
On 2018-08-30T13:56:58+00:00 Miikka-Markus Alhonen wrote:

Created attachment 144558
Writer view after removing the text

Reply at:
https://bugs.launchpad.net/ubuntu/+source/libreoffice/+bug/1772451/comments/10


** Changed in: df-libreoffice
       Status: Unknown => New

** Changed in: df-libreoffice
   Importance: Unknown => Medium

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Title:
  Diacritical marks become visible only after changing view in Writer

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