[Cin] cin freeze with group move?

[Andrew Randrianasulu]

So, I tried some of the simples group move moves.

1) load 28 sec of media (1 audio/1 video mp4).

2) switch to d&d mode.

3) double-clic on video track where media piece is.

It highlight it and add both A and V to group (observe little lines
highlighting them)

try to drag group somewhere.

It usually works one time but not second.

dump reads:

 BC_Signals::dump_stack
cin() [0x88b2082]
linux-gate.so.1(__kernel_rt_sigreturn+0) [0xf7ec8570]
cin() [0x85e6032]
cin(_ZN3EDL18delete_edit_labelsEP9ArrayListIP4EditEi+0x43) [0x85e82d3]
cin(_ZN7MWindow10move_groupEP3EDLP5Trackdi+0xa9) [0x86b6eb9]
cin(_ZN11TrackCanvas9drag_stopEPi+0x3bf) [0x87c708f]
cin(_ZN10MWindowGUI9drag_stopEv+0x4f) [0x86c11df]
cin(_ZN11TrackCanvas15drag_stop_eventEv+0x1a) [0x87b6f7a]
cin(_ZN13BC_WindowBase18dispatch_drag_stopEv+0x683) [0x88d5793]
cin(_ZN13BC_WindowBase23dispatch_button_releaseEv+0xb8) [0x88d5968]
cin(_ZN13BC_WindowBase14dispatch_eventEv+0x73e) [0x88e0d0e]
cin(_ZN13BC_WindowBase10run_windowEv+0x98) [0x88e15b8]
cin(_ZN7MWindow3runEv+0x31) [0x86d7be1]
cin(main+0x4cf) [0x83bfdef]
/lib/libc.so.6(__libc_start_main+0xf9) [0xf5e4d909]
cin(_start+0x21) [0x83c7fa1]

full dump attached ....

Note I have no labels on timeline at this point ...
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