Sergey Sharybin 944cdf04dd Fix for crash when using undo during sketching session.
Currently, grease pencil conflicts with such operators
as undo and set object mode which makes behavior totally
unpredictable and crash for some cases.

The only way to solve this proper is to ger rid of pointers
to data which can chage stored in operator custom data.
2011-08-11 13:40:47 +00:00
2010-10-13 14:44:22 +00:00
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