Cannot unfold categories of timeline inside QmlProfiler

Steps to reproduce:

• open/create Qt Quick 2 UI or application
• switch to Anlyze view, select the Timeline and make the QML Profiler widget as small as possible (or at least not as big as possible)
• start profiling to collect some data
• after closing the app or stopping to profile try to unfold a category of the timeline

Current result:

• categories cannot be unfold (until you resize the Qml Profiler widget)

Expected result:

• categories can be unfold even without resizing the Qml Profiler widget