I've been running into a funny situation with my plugins FlatText and FlatText FREE, where I can undo an operation with one Undo command in SKP 2014 & 2015, but in earlier versions (2013 & v8) I get a jillion Undos on the stack, not just the one. Happens on both Mac and Windows.

Basically, the plugin grabs some pre-made components and assembles them into a group in the model. This part works fine and can be undone with just one Undo command in any version of SKP v8 thru 2015.

The plugin also lets you edit the groups and this is where the weirdness happens. When you use the Revise command in SKP 2014 or 2015, it can be undone with just the one Undo command. But when you use the command and try to undo it in SKP 2013 or v8, you have to wade through nearly all of the several dozen operations that the command performed (stuff like Erase, Hide, Move, Properties, etc.). The very last "Undo" is my command, so it's like my seat-operation committed almost immediately! Even using the dreaded "third parameter true" form of start_operation() does not fix this bug.

If this is just the way the API worked back then, I suppose I can just shrug and move on, making my plugin require 2014 or later. But if this is pointing to a deeper problem in my code, I'd sure like to know about it.

Has anybody else run into this?

Thanks much,
Dave