[QScintilla] Freeze with diff lexer, tabs, ascii and russian characters

[Yuya Nishihara]

Hi,

We have strange freeze with the attached script. It enables QsciLexerDiff
and contains several tabs, alphabets and russian characters.

Environment:
Debian GNU/Linux (sid)
Linux 3.2.0-4-amd64 #1 SMP Debian 3.2.32-1 x86_64 GNU/Linux

libqt4-core       4:4.8.2+dfsg-2
libqscintilla2-8  2.6.2-2

I've attached the backtrace captured by gdb.

Regards,
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