message: Show time delta from previous event in event list
diff: @@ -2894,12 +2894,9 @@ void TraceWin::events_list_render()
  {
  std::string ts_str = ts_to_timestr( event.ts, m_eventlist.tsoffset ) + "ms";
  - if ( event.id > 0 )
  - {
  - // Add time delta from previous event
  - const trace_event_t &event0 = get_event( event.id - 1 );
  - ts_str += " (+" + ts_to_timestr( event.ts - event0.ts, 0, 4 ) + ")";
  - }
  + // Show time delta from previous event
  + if ( prev_ts != INT64_MIN )
  + ts_str += " (+" + ts_to_timestr( event.ts - prev_ts, 0, 4 ) + ")";
  ImGui::Text( "%s", ts_str.c_str() );
  ImGui::NextColumn();
  