Prevent tooltips from disappearing

[pdonias]

A Tooltip disappears when its children change, which seems to be a good behaviour to avoid having ghost tooltips because the mouse never "left" the area:

xen-orchestra/packages/xo-web/src/common/tooltip/index.js

Lines 84 to 88 in 0811e5c

	componentWillReceiveProps(props) {
	if (props.children !== this.props.children) {
	this._removeListeners()
	}
	}

xen-orchestra/packages/xo-web/src/common/tooltip/index.js

Lines 104 to 106 in 0811e5c

	_removeListeners() {
	const node = this._node
	this._hideTooltip()

But when the new children are in the same position, we need to keep the tooltip.

[pdonias]

Fixed by #8031