BUG: Gambit asserts and crashes for some mouse actions in Equilibria split window

[mdnahas]

Reproduce with:

Start gambit,
Load a game tree,
Click "Compute Nash Equilibria"
In pop up window, Select "Compute all Nash Equilbria"
Click "Okay"
In pop up window, click "ok"
Main window is now split into top and bottom. In bottom, click-and-drag your mouse as if trying to select the text in an equilbrium. Specifically, start you click outside the grid (in the bottom or far right of the window) and release the mouse button over the grid.

It will generate the following assertion. If you click "continue", gambit crashes.

ASSERT INFO:
/home/mike/src/wx-install/include/wx-3.2/wx/vector.h(487): assert "idx < m_size" failed in at().

BACKTRACE:
[1] g_closure_invoke
[2] g_signal_emit_valist
[3] g_signal_emit
[4] gtk_main_do_event
[5] g_main_context_dispatch
[6] g_main_loop_run
[7] gtk_main
[8] __libc_start_main

[tturocy]

I regret I am not able to reproduce this.

[mdnahas]

Try it with the attached file. It's proper extension is "gbt". (I changed it to "txt" to get Github to accept it.)

gambit_test1.txt