SelectionInfo.Index out of bounds when entities are added/removed

[allsey87]

On line 207 of qtopengl_widget.cpp, there is an assumption that vecEntities has not changed and that SelectionInfo.Index is always valid over the collection. This does not always hold, and SelectionInfo.Index can be out of range if, for instance, entities are removed from CSpace::m_vecRootEntities during a CLoopFunctions::Reset

One quick fix could be to check if the size of the vector has changed between calls to DrawScene? Or perhaps CSpace could contain a flag indicating that m_vecRootEntities has changed and visualizations can consequently drop any selection info.