ANSI: Crash in AnsiEscapeCodeHandler::parseText

Qt creator crashes when capturing output from a program that can output
unfinished control sequence. For example: "\x1b".

Task-number: QTCREATORBUG-14720
Change-Id: I7535e509a192685aece63aea79234d88153fcb56
Reviewed-by: Tobias Hunger <tobias.hunger@theqtcompany.com>
Reviewed-by: André Hartmann <aha_1980@gmx.de>
Reviewed-by: wonder.mice <wonder.mice@gmail.com>

src/libs/utils/ansiescapecodehandler.h

@@ -62,6 +62,7 @@ private:
 
     bool            m_previousFormatClosed;
     QTextCharFormat m_previousFormat;
+    QString         m_pendingText;
 };
 
 } // namespace Utils