Improved editor for complex (long) pages.

We are editing large, sometimes very complex pages (including elements like tables, expand, tabs, columns and so fourth).

It would greatly improve the editor, if it was possible to collapse elements (like tables, expand, tabs, etc.) in the editor.

All macros are already wrapped in a frame, so it should be rather simple to add a fold in/out button to the frame, that either hides or displays the contents of the macro while in the editor.