flipped class added multiple times

[xjArea]

Information:

• Prism version: 1.23
• Plugins: Previewers

When tip add flipped className, it will add many times, the class name will repeat.

Here is the screenshort in Chrome :

[mAAdhaTTah]

IE10 is long since EOL'd and unsupported by Prism.

[xjArea]

Prism can run on IE10, just need to add the Polyfill of Element.prototype.matches(), if has the sub plugins, prevent auto create and manual operate Prism.highlightAll(), than we can solve the problem, I've done a lot of tests using Prism on IE10, although there are some small problems, but it really can run, so please don't close this issue, I'm already fixed the BUG and passed the test on IE10... 😂😂😂

[RunDevelopment]

@xjArea It's not that we are unable to support IE10. We don't want to support IE10. IE10 already EOL'd and barely has any users left today. It is not rational to focus our development efforts on a browser that close to none of our users have.

[xjArea]

OK, let's forget this IE10 problem, but there is another problem with this plugin. When tip add flipped className, it will add many times, the class name will repeat. This is not the IE10 problem. Chrome and Firefox has the same problem, forgive me, I'm a lazy person and I don't want to open an new issue. Could we solve it ? When you solve this problem, maybe you can add the above code by the way, anyway, Hitchhiker ? ha-ha. 🤣

Here is the screenshort in Chrome :

[mAAdhaTTah]

Edited OP to capture the new issue. Will look into this. We will not be adding the IE10 code as part of that PR though.