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Also, make sure the category dragger only reacts to vertical mouse
movements.

Change-Id: Ic53db9030536a1f2d35ea02facb920a4d3f0a005
Task-number: QTCREATORBUG-15333
Reviewed-by: Joerg Bornemann <joerg.bornemann@theqtcompany.com>

The height of the trace is not sufficient to determine this as by
hiding categories it can be reduced to 0 without the trace being empty.

Change-Id: Ic8100b4da9c93808a6d49cf4ceba12de391ebc0e
Task-number: QTCREATORBUG-14277
Reviewed-by: Joerg Bornemann <joerg.bornemann@theqtcompany.com>

This further cuts down the initial loading time by a large margin and
can save some memory.

Change-Id: I8c3240d3137461229fa5576ad33c0d77b28776e0
Reviewed-by: Joerg Bornemann <joerg.bornemann@theqtcompany.com>

Apparently the parent is not always defined and we get warnings about
that.

Change-Id: I574d68c2668fef53af9422049143a0decf05286f
Reviewed-by: Joerg Bornemann <joerg.bornemann@theqtcompany.com>

Change-Id: I964b2f149e237eb25a08600e8dab8968e8bc0cb9
Reviewed-by: Kai Koehne <kai.koehne@theqtcompany.com>

Split it up into some more files and remove all implicit cross
referencing by ID.

Change-Id: I3f829d6701906b1b054d18680d9e670b35b1716a
Reviewed-by: Kai Koehne <kai.koehne@theqtcompany.com>