Tracing: ComboBox seems to grab the focus completely when used

Steps to reproduce:

• switch to PerfProfiler or QmlProfiler view (Flamegraph tab)
• use the combo box at the right to select something from its menu
• click somewhere inside the flame graph (or just hover over the combo box again)

Current result:

• the combo box opens its drop down menu again

Note: It feels as if the combo box has a triple state (clicking the drop down arrow twice ( ? ) after the first usage seems to lose the focus behaviour again. (but using it again triggers the issue again)