I want to write an addon that can combine two selections with a logical AND.
For example, the user use via normal gui
Then he calls the addon, the addon gets the current selection, the selection made before, combine them and write the selection back.
My problem is I don't know how I can access these history data via python nor if it's possible. This would be my favorite way of workflow for the addon.
I can extend the addon with a call to store the actual selection, so the user make a similar select, call the addon to store the current selection, make another similar select and call the addon to combine the both selections and write it back.
For this way I need to store a customized boolean at the bmesh faces/edges/vertices data, but I can't figure it out how. If I try to store custom data I run in these error:
bm.faces['and_select'] = False
Traceback (most recent call last):
File "", line 1, in
AttributeError: BMElem[key]: invalid key, must be a BMLayerItem
An example how this must be done would help.