[traceviewer] Display issue

[PatWie]

Hope this is the correct place to report the issue. I am using trace-Viewer for visualizing some CUDA profiling results.

Unfortunately, the viewer does not stack overlapping events and one event-bar is hiding other events.

Actual output:

Data to reproduce:
MonteCarloMultiGPU.json.zip

Assigning each bar to a different ph clearly shows these are overlapping events (the highlighted bar is covering 3 other bars, all are visible below)

Data to reproduce:
MonteCarloMultiGPU-all.json.zip

The time unit is nano-seconds and cannot be changed. This issue seems to be related to:
#927