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描述
Right now, each Markdown link in each post in Mattermost mounts a LinkTooltip component which renders a div in the DOM, even if there is no tooltip for the given link. Due to the current plugin API for those tooltips though, it doesn’t seem like we can completely remove the LinkTooltip component when a link doesn’t support a tooltip.
We should make it so that we only render anything in the DOM for the link tooltip if the user is actively hovering over the link. That way, we’ll only render up to one Portal at a time.
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