UndoManager and UndoAction (SOLVED)

#1 Nope, never touched that.

If you have a source code license to the legacy engine, download TGB 1.8 and have a look at how the level builder uses it as an example. The script file can be found under this path: tgb/tools/levelEditor/scripts/undo.ed.cs

#2 I haven't used it either, but it might be worth looking at the C++ side even if your not comfortable with it (engine/collection/undo...). There seems to be another undo-related class not on the wiki called "UndoScriptAction", above it was this comment (haven't tried it, but it looks exposed to TS):

// 
// Script Undo Action Creation
// 
// Undo actions can be created in script like this:
// 
// ...
// %undo = new UndoScriptAction() { class = SampleUndo; actionName = "Sample Undo"; };
// %undo.addToManager(UndoManager);
// ...
// 
// function SampleUndo::undo()
// {
//    ...
// }
// 
// function SampleUndo::redo()
// {
//    ...
// }

Hope it helps? :-)

#3 It's used heavily in the legacy editors. I will probably be using it for my editors as well, but I haven't gotten that far yet. You just want to know how to attach an action, is that it?

#4 @Mich, that would be a great start.

#5 Found an example in the commercial legacy product. The implementation is a bit more complicated than I had thought, but very logical.