apply change: Fix adding component with non default simple attributes. #67
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When adding a component with simple attributes, these attributes might
have default values that aren't
nil
. Previously, when such a thingoccurred it would result in a
MergeError
, because the removed changewas assumed to be
nil
since the component was just added, but inpractice it would be set to the default value.
The solution is to set the removed change value to the default value.