Update MMDrawerController.m

[jhjiang]

Here is another way to support editing/dragging cells in the center view controller.
Make open pan gesture enable only at both sides, even at the edge of the container view.
MMDrawerSidePanGestureFlag & MMDrawerPanGestureSideContainerWidth are configurable to fit different situation.

[kcharwood]

@jhjiang Would you mind providing more information around the problem you are trying solve that isn't currently supported?

[jhjiang]

Please refer to below image.
It's allowed to limit users to drag the side containers out of either edges, only by starting "panning" from area A or B.
"MMDrawerPanGestureSideContainerWidth" is the width of area A or B.
"MMDrawerSidePanGestureFlag" is a switch to enable this function. Open it, and users can do any operations in the center area, which won't be catched by MMDrawerController.

[rivera-ernesto]

No need to add those lines as Git Blame will properly identify the author of any given line.

[jhjiang]

These comments are only used as individual signals in my local workspace.
Thanks for your kindly reminder all the same. :)