is there a Python undo block?

[anim]

is there a possibility to specify undo blocks in my python shelf tool?

or marking the whole shelf button as a single undo step will be sufficient

currently it's not always the case

when I click on my shelf button, then the name of that tool is added to Undo History, when I hit undo, all changes made by my script are correctly undone

but when I ALT-click to my shelf button which is aware of modifier keys through kwargs, nothing is added to Undo history and hitting undo just undos another step leaving changes made by my tool untouched

not sure if this is the bug with modifier keys or not, does anybody have experience with this? or is there a way to define undo blocks manually?

[edward]

This sounds like a bug to me.

[anim]

thanks edward, I'll try to find out what is causing this, it may not be the modifier keys since it's happening with parameter callbacks too