[Tuxpaint-devel] switchin() switchout()

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I see many useful applications of these functions, but I can't solve this:
Tuxpaint calls switchout() when user decides to create new image, but also calls this function when user uses Undo. Can I avoid calling switchout() when Undo?

Using switchin() I create an important data - table. Each image can have quite different values in this variable, so each switchout() frees this data (in case of creating new image). Undo also calls switchout() - that's makes problem.

Best,
Adam