Fix popover when using append

[stefanneculai]

Using a HTML object for content is currently adding the same content several times in popover. The old content should be removed before adding the new one.

[cvrebert]

Presumably fixes #12571.

[cvrebert]

Approximate duplicate of #12604.

[stefanneculai]

Yes, it is like #12604 only that it does empty all the time. It looks like @fat suggested to do empty all the time on a comment.

[stefanneculai]

Test added too.

[fat]

swoon - lgtm thanks !!

[programcsharp]

This is bad because it blows up the content. If you're planning on using it later or swapping it around, you can't. jQuery won't let you reattach the content or rewire events to it. Instead, should do .children().detach(), like:

    $tip.find('.popover-content').children().detach()
    $tip.find('.popover-content')[ // we use append for html objects to maintain js events
      this.options.html ? (typeof content == 'string' ? 'html' : 'append') : 'text'
    ](content)

[cvrebert]

@programcsharp File a new bug.