Expand/Collapse transition about sl-vue-tree HOT 3 OPEN

Hey. I have to replace v-if with v-show to allow transitions. Looks like it's easy to hook up, will do a PR for that

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Thanks a lot. I don't entirely see why v-show is necessary as transitions as described here https://vuejs.org/v2/guide/transitions.html work with v-if too. I just imagined that with a transition wrapper added, the styles of the enter and leave classes could be changed to customize the transition

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v-show appears to be preferred in this scenario (see: the vuejs docs) for performance reasons. I'm debugging significant and problematic performance issues with my sl-vue-tree. I can't (yet) tell if they're related to this library itself, or to vuejs. But according to the docs v-show would be appropriate here.

Having said that, however, I'm still seeing performance issues with v-show, even though it should be much faster (it's just css show/hide).

It's slightly OT for this thread, but the performance issue I'm seeing is >100ms to open a node with 26 children. This becomes problematic when I implement an "open all" icon, and it takes several seconds to open 50 nodes.

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