fixed rightpanel overlapping leftpanel issue

[filipengberg]

If the user starts dragging the center panel to show the right panel, but then drags the other way to show the left panel, the right panel would be visible on the left side, overlapping the left panel until the user let go of the center panel.

This pull request fixes that issue by preventing the user to start dragging the center panel in one direction and then dragging it the other way.

[maziyarpanahi]

Hi,
I added your two else if statements to prevent this but still happens. I disable the right panel but not allowing users to swipe but if you swipe the left side and back you can still see the right side like you said.