Meld produces bugus visual diff for medium-size files

[Victor Engmark]

How to reproduce:
1. Create build logs about this size (unfortunately I can't include these):
  $ wc successful.txt
    172184 595928 13352058 successful.txt
  $ wc failing.txt
    144713 568242 11195693 failing.txt
2. meld successful.txt failing.txt &

About a second after `meld` started running I got the following error message:

Traceback (most recent call last):
  File "/usr/lib/meld/meld/filediff.py", line 464, in on_current_diff_changed
    chunk0 = self.linediffer.get_chunk(chunk_id, 1, 0)
  File "/usr/lib/meld/meld/diffutil.py", line 223, in get_chunk
    chunk = self._merge_cache[index][sequence]
IndexError: list index out of range

Afterwards I noticed that several of the colored lines were offset from the actual different lines. Could it be that the line count is stored in only 16 bits?

File -> Format as patch... produces a *correct* patch, so it's not a `diff` issue.

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: meld 1.5.2-1ubuntu2
ProcVersionSignature: Ubuntu 3.0.0-17.30-generic 3.0.22
Uname: Linux 3.0.0-17-generic x86_64
NonfreeKernelModules: wl nvidia
ApportVersion: 1.23-0ubuntu4
Architecture: amd64
Date: Mon Apr 30 10:51:49 2012
ExecutablePath: /usr/bin/meld
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64+mac (20101008)
InterpreterPath: /usr/bin/python2.7
PackageArchitecture: all
ProcEnviron:
 LC_PAPER=en_GB.UTF-8
 SHELL=/bin/bash
 PATH=(custom, user)
 LANG=en_US.UTF-8
SourcePackage: meld
UpgradeStatus: Upgraded to oneiric on 2012-02-24 (65 days ago)

[Paul White (paulw2u)]

We are sorry that we do not always have the capacity to review all reported bugs in a timely manner.

This release of Ubuntu is no longer receiving maintenance updates. If this is still an issue using a maintained version of Ubuntu then please let us know otherwise this report can be left to expire in approximately 60 days time.

Paul White
[Ubuntu Bug Squad]

[Launchpad Janitor (janitor)]

[Expired for meld (Ubuntu) because there has been no activity for 60 days.]