Savegame handler of Std::ClimbingBox doesn’t work properly

[Quintus]

The climbing box’s climbing plant is always shown after loading a savegame. Must be some coding error in Std::ClimbingBoxt#attach.

Vale,
Quintus

[Quintus]

Turns out that ClimbingBox' on_save and on_load event handlers are fine. The problem is in the C++ code for the savegame handling -- it saves the generates sprites of the climbing box directly into the savegame file.