[Bug 499790] New: [te_IN][pango]GSUB delete key can't delete the whole char in f10,but works well in rhel5.3

[Red Hat Bugzilla]

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Summary: [te_IN][pango]GSUB delete key can't delete the whole char in f10,but works well in rhel5.3

https://bugzilla.redhat.com/show_bug.cgi?id=499790

Summary: [te_IN][pango]GSUB delete key can't delete the whole
                    char in f10,but works well in rhel5.3
           Product: Fedora
           Version: 10
          Platform: i386
        OS/Version: Linux
            Status: NEW
          Severity: medium
          Priority: low
         Component: pango
        AssignedTo: [e-mail]
        ReportedBy: [e-mail]
         QAContact: [e-mail]
                CC: [e-mail], [e-mail]
    Classification: Fedora
    Target Release: ---

Description of problem:
GSUB press Delete key to delete the whole char,it can't delete the whole char
in f10,but works well in rhel5.3.
I think it is a regression bug.

Version-Release number of selected component (if applicable):
pango-devel-1.22.1-1.fc10.i386
pango-1.22.1-1.fc10.i386
pangomm-2.14.0-2.fc10.i386

How reproducible:
always

Steps to Reproduce:
1.In gedit input U+0C15 U+0C4D U+0C15 
2.Press Delete key to delete the char
3.

Actual results:
It can't delete the whole char,it will delete part of the char

Expected results:
It will delete the whole char.

Additional info:
All of chars in [te_IN][GSUB] has the same problem.
But in rhel 5.3 they work well.
So I think it is a regression problem.

[Bug 499790] [te_IN][pango]GSUB delete key can't delete the whole char in f10

[Red Hat Bugzilla]

Please do not reply directly to this email. All additional
comments should be made in the comments box of this bug.

https://bugzilla.redhat.com/show_bug.cgi?id=499790

Lawrence Lim  changed:

What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |[e-mail]
            Summary|[te_IN][pango]GSUB delete   |[te_IN][pango]GSUB delete
                   |key can't delete the whole  |key can't delete the whole
                   |char in f10,but works well  |char in f10
                   |in rhel5.3                  |

[Bug 499790] [te_IN][pango]GSUB delete key can't delete the whole char in f10

[Red Hat Bugzilla]

Please do not reply directly to this email. All additional
comments should be made in the comments box of this bug.

https://bugzilla.redhat.com/show_bug.cgi?id=499790

A S Alam  changed:

What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |i18n
                 CC|                            |[e-mail],
                   |                            |[e-mail]

[Bug 499790] [te_IN][pango]GSUB delete key can't delete the whole char in f10

[Red Hat Bugzilla]

Please do not reply directly to this email. All additional
comments should be made in the comments box of this bug.

https://bugzilla.redhat.com/show_bug.cgi?id=499790

--- Comment #2 from koka xiong   2009-05-11 03:04:13 EDT ---
Description of problem:
GSUB press Delete key to delete the whole char,it can't delete the whole char
in f10

Version-Release number of selected component (if applicable):
pango-devel-1.22.1-1.fc10.i386
pango-1.22.1-1.fc10.i386
pangomm-2.14.0-2.fc10.i386

How reproducible:
always

Steps to Reproduce:
1.In gedit input U+0C15 U+0C4D U+0C15 
2.Press Delete key to delete the char
3.

Actual results:
It can't delete the whole char,it will delete part of the char

Expected results:
It will delete the whole char.

Additional info:
All of chars in [te_IN][GSUB] has the same problem.

[Bug 499790] [te_IN][pango]GSUB delete key can't delete the whole char in f10

[Red Hat Bugzilla]

Please do not reply directly to this email. All additional
comments should be made in the comments box of this bug.

https://bugzilla.redhat.com/show_bug.cgi?id=499790

--- Comment #3 from Bug Zapper   2009-11-18 06:54:52 EDT ---

This message is a reminder that Fedora 10 is nearing its end of life.
Approximately 30 (thirty) days from now Fedora will stop maintaining
and issuing updates for Fedora 10.  It is Fedora's policy to close all
bug reports from releases that are no longer maintained.  At that time
this bug will be closed as WONTFIX if it remains open with a Fedora 
'version' of '10'.

Package Maintainer: If you wish for this bug to remain open because you
plan to fix it in a currently maintained version, simply change the 'version' 
to a later Fedora version prior to Fedora 10's end of life.

Bug Reporter: Thank you for reporting this issue and we are sorry that 
we may not be able to fix it before Fedora 10 is end of life.  If you 
would still like to see this bug fixed and are able to reproduce it 
against a later version of Fedora please change the 'version' of this 
bug to the applicable version.  If you are unable to change the version, 
please add a comment here and someone will do it for you.

Although we aim to fix as many bugs as possible during every release's 
lifetime, sometimes those efforts are overtaken by events.  Often a 
more recent Fedora release includes newer upstream software that fixes 
bugs or makes them obsolete.

The process we are following is described here: 
http://fedoraproject.org/wiki/BugZappers/HouseKeeping

[Bug 499790] [te_IN][pango]GSUB delete key can't delete the whole char in f10

[Red Hat Bugzilla]

Please do not reply directly to this email. All additional
comments should be made in the comments box of this bug.

https://bugzilla.redhat.com/show_bug.cgi?id=499790

Pravin Satpute  changed:

What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |[e-mail]
            Version|10                          |rawhide

--- Comment #4 from Pravin Satpute   2009-11-24 00:20:20 EDT ---
i guess it will get fixed auto with harfbuzz and pango merger,
moving to rawhide

[Bug 499790] [te_IN][pango]GSUB delete key can't delete the whole char in f10

[Red Hat Bugzilla]

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comments should be made in the comments box of this bug.

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Parag  changed:

What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |[e-mail]
            Version|13                          |rawhide

[Bug 499790] [te_IN][pango]GSUB delete key can't delete the whole char in f10

[Red Hat Bugzilla]

Please do not reply directly to this email. All additional
comments should be made in the comments box of this bug.

https://bugzilla.redhat.com/show_bug.cgi?id=499790

Akira TAGOH  changed:

What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |[e-mail]
               Flag|                            |needinfo?

--- Comment #6 from Akira TAGOH  2011-09-09 04:31:38 EDT ---
No upstream bug for this?

[Bug 499790] [te_IN][pango]GSUB delete key can't delete the whole char in f10

[Red Hat Bugzilla]

Please do not reply directly to this email. All additional
comments should be made in the comments box of this bug.

https://bugzilla.redhat.com/show_bug.cgi?id=499790

Fedora Admin XMLRPC Client  changed:

What    |Removed                     |Added
----------------------------------------------------------------------------
         AssignedTo|[e-mail]    |[e-mail]
               Flag|needinfo?                   |

--- Comment #7 from Fedora Admin XMLRPC Client  2012-01-10 10:43:41 EST ---
This package has changed ownership in the Fedora Package Database.  Reassigning
to the new owner of this component.

[Bug 499790] [te_IN][pango]GSUB delete key can't delete the whole char in f10

[Red Hat Bugzilla]

Product: Fedora
https://bugzilla.redhat.com/show_bug.cgi?id=499790

Fedora Admin XMLRPC Client  changed:

What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|[e-mail]          |[e-mail]

--- Comment #9 from Fedora Admin XMLRPC Client  ---
This package has changed ownership in the Fedora Package Database.  Reassigning
to the new owner of this component.

[Bug 499790] [te_IN][pango]GSUB delete key can't delete the whole char in f10

[Red Hat Bugzilla]

https://bugzilla.redhat.com/show_bug.cgi?id=499790

Akira TAGOH  changed:

What    |Removed                     |Added
----------------------------------------------------------------------------
    External Bug ID|                            |GNOME Desktop 710695

[Bug 499790] [te_IN][pango]GSUB delete key can't delete the whole char in f10

[Red Hat Bugzilla]

https://bugzilla.redhat.com/show_bug.cgi?id=499790

Akira TAGOH  changed:

What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |CLOSED
         Resolution|---                         |NOTABUG
        Last Closed|                            |2014-10-09 05:16:55

--- Comment #10 from Akira TAGOH  ---
After taking a look at UAX#29 and the Pango code, current behavior is following
the Unicode standard unfortunately.

Here is the details how the text segmentation is decided in Pango according to
the standard:

First, the character type for the above characters are:
U+0C15  OTHER LETTER
U+0C4D  NON SPACING MARK

Pango is looking at the grapheme boundary rule to decide if a character should
be deleted by backspace key. it's defined as following in UAX#29:

* Break at the start(GB1) and end(GB2) of text.
* Do not break between a CR and LF(GB3). Otherwise, break before(GB4) and
after(GB5) controls.
* Do not break Hangul syllable sequences(GB6,GB7,GB8).
* Do not break between regional indicator symbols(GB8a).
* Do not break before extending characters(GB9).

Only for extended grapheme clusters:
* Do not break before SpacingMarks(GB9a), or after Prepend characters(GB9b).
* Otherwise, break everywhere.

According to the table 2 in UAX#29, non-spacing mark is categorized into
Extend. so it doesn't break *before* U+0C4D. but no rules to not break *after*
Extend.

At this point, there are no standard that the software can refers the material
to prevent that behavior. maybe good to escalate this to Unicode.org then.