gedit with snippets plugin segfaults when moving text with mouse

[Samuel Hym]

To reproduce:
- activate the snippets plugin;
- select a part of the text you're editing;
- move it (or copy it, holding ctrl) with the mouse.
Segfault.

The crash seemingly appears in /usr/lib/gedit/plugins/snippets/document.py, line 861, the first line of on_drag_data_received.

(Previously partially reported as Bug #891816).

ProblemType: Crash
DistroRelease: Ubuntu 11.10
Package: gedit 3.2.1-0ubuntu2
ProcVersionSignature: Ubuntu 3.0.0-13.22-generic 3.0.6
Uname: Linux 3.0.0-13-generic i686
ApportVersion: 1.23-0ubuntu4
Architecture: i386
CrashCounter: 1
Date: Tue Nov 22 15:52:21 2011
EcryptfsInUse: Yes
ExecutablePath: /usr/bin/gedit
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Beta i386 (20110918)
ProcCmdline: gedit
SegvAnalysis:
 Segfault happened at: 0xe4ec1c: mov -0x4(%eax),%ecx
 PC (0x00e4ec1c) ok
 source "-0x4(%eax)" (0x0000007c) not located in a known VMA region (needed readable region)!
 destination "%ecx" ok
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: gedit
StacktraceTop:
 ?? () from /lib/i386-linux-gnu/libc.so.6
 ?? () from /usr/lib/python2.7/dist-packages/gi/_gi.so
 ?? () from /usr/lib/python2.7/dist-packages/gi/_gi.so
 PyCFunction_Call (func=<built-in method invoke of gi.FunctionInfo object at remote 0xa7df9cc>, arg=([<Atom at remote 0xa7de7d4>, <Atom at remote 0xa7de7fc>, <Atom at remote 0xa7de824>, <Atom at remote 0xa7de84c>, <Atom at remote 0xa7de874>, <Atom at remote 0xa7de89c>, <Atom at remote 0xa7de8c4>, <Atom at remote 0xa7de8ec>],), kw={}) at ../Objects/methodobject.c:85
 ext_do_call (nk=176008652, na=0, flags=<optimized out>, pp_stack=0xbf93bb74, func=<built-in method invoke of gi.FunctionInfo object at remote 0xa7df9cc>) at ../Python/ceval.c:4331
Title: gedit crashed with SIGSEGV in PyCFunction_Call()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare

[Apport retracing service (apport)]

Thank you for taking the time to report this crash and helping to make this software better. This particular crash has already been reported and is a duplicate of bug #893370, so is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Please continue to report any other bugs you may find.