QmlProfiler: Failing almost always to save QML trace

Steps to reproduce:

• gather some QML profiling data
• right click on the timeline, choose "Save QML Trace"
• switch the location ("Where") from its default location to somewhere else (using mouse)
• try to click at "Save"

Current result:

• as soon as the mouse moves again (towards the Save button) the dialog vanishes

Note: Before I managed to save the QML trace the "Save as" field was empty, clicking into it entering something and trying to click at "Save" resulted in the same issue.. Afterwards this field has a default value, trying to change it and hitting Save now works sometimes, but the dialog might vanish before reaching the Save button as well.