When specified, replace rather than merge the [unit] sub-tags. Does not effect [object], [trait], [effect] or [advancement].
For example:
[modify_unit]
[filter]
id=Deoran
[/filter]
mode=replace
[filter_recall]
[not]
id="Sir Gerrick"
[/not]
[/filter_recall]
[/modify_unit]
will replace the current contents of [filter_recall] with the given contents. Without mode=replace, the contents would be appended to the previous contents.
This means [object], [advancement], and [trait] tags within [modify_unit]
can now use delayed_variable_substitution=yes.
This is currently needed for adding teleport, backstab, and leadership abilities.
