def enterEvent(self, event):
        self.layout().setMargin(CurrentTheme.PIP_IN_FRAME_WIDTH)
iterate over the contents of a gtf file.
dataset/ETHPy150Open VisTrails/VisTrails/vistrails/gui/graphics_view.py/QPIPGraphicsView.enterEvent--crossover with--dataset/ETHPy150Open CGATOxford/cgat/CGAT/GTF.py/merged_gene_iterator