Three bar icon should really be two different icons

You know those three bars in the upper left corner,

Well normal users all know that it has two functions, to make the sidebar slide one way, and also make the sidebar slide the other way, all depending on sidebar state.
But we other abnormal users always have to click it a couple of times to get a hang of it. Furthermore a few days later we forget and well, go clicking it again…
I have a proposal: use slightly different icons in the two different states!

Discuss this on our forum.