#310 horizontal QwtSlider with trailing scale needs 3px taller sizeHint

[Anonymous]

For horizontal QwtSlider with trailing scale needs 3px taller sizeHint
only necessary when the scale goes to a magnitude 1,000 or greater
because the comma is getting clipped off
I measured the comma height at 5px
but the amount of the comma shown was only 2px
which looks like a period rather than a comma

[Anonymous]

correction: I meant to write LeadingScale, not trailing scale