MultiSplitPane should not grab touches inside content

[ericnondahl]

Fixing an issue where the MultiSplitPane was grabbing touches inside the content area - it should only consume touches on the handles which is the interaction area of the class. This was blocking other listeners behind the MultiSplitPane.

[kotcrab]

I'm pretty sure returning true does not affect event propagation within stage2d. From InputListener#touchDown javadocs:

	/** Called when a mouse button or a finger touch goes down on the actor. If true is returned, this listener will receive all
	 * touchDragged and touchUp events, even those not over this actor, until touchUp is received. Also when true is returned, the
	 * event is {@link Event#handle() handled}.
	 * @see InputEvent */

From Event#handle()

	/** Marks this event as handled. This does not affect event propagation inside scene2d, but causes the {@link Stage} event
	 * methods to return true, which will eat the event so it is not passed on to the application under the stage. */

Which means that other listeners in stage2d will receive event but it won't be passed to next InputProcessor in InputMultiplexer, not sure if you meant that.

I'll merge this but I need to fix cursor handling anyways. Seems like some libgdx update changed how exit() is called which now resets custom cursor before dragging has been finished. This also affects VisSplitPane.

Thanks!

[kotcrab]

Fixed. I've also added you to contributors list. Note that next snapshot version was set to 1.4.0-SNAPSHOT if you want to try it out before release.

[ericnondahl]

Thanks - It was another InputProcessor that was blocked for us here, not other scene2d UI - that's an interesting distinction, I wasn't aware of that. We are almost always using a second InputProcessor so i'm pretty conservative on returning true only when needed.