Start profiling clears Timeline and JavaScript although profiling is disabled

Steps to reproduce:

• open a QML project
• start profiling it to gather some data
• afterwards, disable profiling (hit the red bubble)
• start profiling again

Expected result:

• all tabs of the profiler still show the data gathered with the first run

Current result:

• Timeline and JavaScript tab are purged
• Events tab holds still the data gathered with the first run