Cannot interactively edit axes limits using Qt5 backend #6082
Description
Python 3.5.1, matplotlib 1.5.1, Qt5 backend ((Py)Qt5.5.1).
plt.gca() (so axes limits are 0, 1) then click on the "figure options" button.
Typing some values or backspace in the xlimits/ylimits fields has no effect. I think this may be due to a change in behavior of QDoubleValidator between Qt4 and Qt5?