In the gentable widget, you could drag the first and last handle too and this led to an inconsistent and wrong behavior like the following:
I fixed the code so that you cannot x-drag the first and the last handle inside the graph on the x-axis, but only on the y-axis. And there is another problem with the fontcolour in the titlebar too: if you have a transparent fontcolour, when the window looses focus the hidden title reappears… I fixed this too. I will do a PR soon.
EDIT: sent PR. 