html comments disappear

Hi,

Thank you for the nice plugin!

In most cases it works fine but it still may have the html comment problem.

Step to reproduce:

1. Past below in the Text editor:

aaaa

<!– comment –>

bbbb

<!– comment –>

2. Switch to the Visual editor.
3. Hit the Publish (or Update) buttons.
4. Disappear below the first comment.

I’ve tested with WordPress 4.2.2 and Preserved HTML Editor Markup Plus 1.5.2.

https://www.ads-software.com/plugins/preserved-html-editor-markup-plus/