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Modules like SmartSection, News and Article have an option in the Preferences where you can select the editor you want to use.
Problem is that Mastop-Publish doesn't have this option and comes standard with TinyMCE. You're forced to use this editor.
The XOOPS equivalent of TinyMCE is
Tinyedtor.
I use Tinyeditor in combination with SmartSection and WF-Links 1.03. So far I haven't noted that Tinyeditor makes changes to the HTML-code upon saving.