Bug 157815 - tamil vowel signs "0BC1..0BC2 0BC6..0BC8 0BCA..0BCC" treated differently by icu and pango
tamil vowel signs "0BC1..0BC2 0BC6..0BC8 0BCA..0BCC" treated differently by i...
Product: Fedora
Classification: Fedora
Component: openoffice.org (Show other bugs)
All Linux
medium Severity medium
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Assigned To: Caolan McNamara
: i18n
Depends On:
Blocks: Indic FC4Blocker
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Reported: 2005-05-16 01:18 EDT by Lawrence Lim
Modified: 2014-03-25 20:52 EDT (History)
4 users (show)

See Also:
Fixed In Version: 1.9.108-4
Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
Last Closed: 2005-06-10 11:22:25 EDT
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Regression: ---
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RHEL 7.3 requirements from Atomic Host:
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Attachments (Terms of Use)
screenshot with openoffice.org-1.9.108-1 (93.54 KB, image/png)
2005-06-09 23:31 EDT, Lawrence Lim
no flags Details

External Trackers
Tracker ID Priority Status Summary Last Updated
OpenOffice.org 50172 None None None Never

  None (edit)
Description Lawrence Lim 2005-05-16 01:18:49 EDT
Description of problem:
Currently text selection, cursoring and text editing (using del key) have the
same problemdoes not highlight complete character in Indic. It is not consistent
with gtk+ application.

Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:
1. LANG=ta_IN.UTF-8
2. enter 'kg'

cusoring issue:
3. move curosr back using '<-' key

delete issue:
3. move to the front of the character by pressing 'Home'
4. press delete once

text selection:
3.  shift '->' or '<-' to highlight the character
Actual results:
cursoring issue: takes two keypress to move across the character
delete issue: takes two keypress to delete the character
text selection: takes two keypress to hightlight the character

Expected results:
cursoring issue: one keypress as it is one composed character
delete issue:  one keypress as it is one composed character
text selection: one keypress as it is one composed character

Additional info:
Comment 2 Caolan McNamara 2005-06-01 14:34:37 EDT
This is some sort of regression or change from 1.1.4 to 1.9.X in the icu module.
Affects upstream as well.
Comment 3 Caolan McNamara 2005-06-03 06:32:13 EDT
See http://www.openoffice.org/issues/show_bug.cgi?id=50172 for my testcase to
demo regression in icu 2.2 to icu 2.6

But also see http://www.jtcsv.com/cgibin/icu-bugs?findid=1587 
Comment 4 Caolan McNamara 2005-06-03 07:17:17 EDT
According to the icu bug report this is the correct behaviour ? What do you
think,  want me to try and revert the change anyway ?
Comment 5 Caolan McNamara 2005-06-03 08:58:08 EDT
The current http://www.unicode.org/reports/tr29/ says that The
Grapheme_Cluster_Break property values are defined in
http://www.unicode.org/Public/UNIDATA/auxiliary/GraphemeBreakProperty.txt and
that list does not list the tamil vowel signs, but the older
http://www.unicode.org/Public/3.2-Update/DerivedCoreProperties-3.2.0.txt did. So
*apparently* icu is following the spec. 

I have a patch at http://qa.openoffice.org/issues/show_bug.cgi?id=50172 to
revert to the old OOo/icu behaviour which is the same as current pango and I'll
put it in into our OOO in the interim (i.e. 1.9.106-2)

any idea which of these behaviours is *correct* the pango one, or the icu one ?
I've matched the pango one for now.
Comment 8 Lawrence Lim 2005-06-09 23:30:08 EDT
Tested with openoffice.org-1.9.108-1, here's the breakdown.

Cursoring Issue:
bn,gu,hi,pa,ta: takes 1 keypress which is correct. all good.

Delete Issue:
bn,gu,hi,pa,ta: takes 1 keypress (Delete Key) which is correct. all good.

Text Selection:
bn,gu,hi,pa,ta: takes 1 keypress (shift + ->) which is correct. all good.

Additional Issue:
Seems the width of character for bn, gu, hi are not right. Takes the space of
two characters instead of one. Please see attached screenshot, observe the
highlight of the character after i did shift+-> ONCE.
Comment 9 Lawrence Lim 2005-06-09 23:31:43 EDT
Created attachment 115282 [details]
screenshot with openoffice.org-1.9.108-1 

character width issue.
Comment 10 Caolan McNamara 2005-06-10 06:14:40 EDT
character width issue should be the same problem as rh#157813#
Comment 11 Caolan McNamara 2005-06-10 11:22:25 EDT
putting the rendering issue aside as rh#157813# this works with 1.9.108-4 for

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