As the title says. When editing any page ending with .css or .js, ext.wikieditor.toolbar.styles module is simply not loaded, but the WikiEditor toolbar is there none-the-less.
The style governs the edit box line-height (1.5em) and resize behaviour (vertical). With these two rules missing, the edit box is vertically squished and can be resized horizontally. This results in inconsistent editing screens.
(edit:) I also note that the search/replace button is missing from the advaced toolbar.
Is this a possible conflict with CodeEditor (which I have disabeld BTW)?