Fix #55 Disable popper events when tooltip is hidden

Author: Guillaume Chau

src/tooltip.js

@@ -299,6 +299,7 @@ export default class Tooltip {
 		if (this._tooltipNode) {
 			this._tooltipNode.style.display = ''
 			this._tooltipNode.setAttribute('aria-hidden', 'false')
+			this.popperInstance.enableEventListeners()
 			this.popperInstance.update()
 			return this
 		}
@@ -382,6 +383,8 @@ export default class Tooltip {
 		this._tooltipNode.style.display = 'none'
 		this._tooltipNode.setAttribute('aria-hidden', 'true')
 
+		this.popperInstance.disableEventListeners()
+
 		clearTimeout(this._disposeTimer)
 		const disposeTime = directive.options.disposeTimeout
 		if (disposeTime !== null) {