Bugs item #3539256, was opened at 2012-07-01 03:12
Message generated for change (Tracker Item Submitted) made by genete
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Category: Crasher/nasty bug
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Genete (genete)
Assigned to: Nobody/Anonymous (nobody)
Summary: Lower SImple Circle quickly may hang out

Initial Comment:
I've found a combination of layers that makes Synfig Studio hang. When you 
lower the Simple Circle from the first paste canvas layer quickly repeatedly 
you find that it stop responding.
A debug session shows the code stopped at the line 344 of context.cpp:
RWLock::WriterLock lock((*context)->get_rw_lock());
Inspecting the Context iterators values results that *context is pointing to a 
layer beyond the end of the layer stack.
It might be caused by the lower layer action that doesn't wait correctly the 
time to the layers to render and so it thinks that the action is ready and 
tries to decrease the layer position out of the context. It might happen with 
other layers and combinations.
See attached example file.

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You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=757416&aid=3539256&group_id=144022

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