Change tracking and replace: unexpected behavior

[Bennett Helm]

I just noticed that searching for and replacing text interacts with  
change tracking in an unexpected way.

Create a document with multiple occurrences of "foo". Turn change  
tracking on, select a chunk of text (including some occurrences of  
"foo"), and delete. Now go to the top and turn change tracking *off*.  
Using Edit > Find & Replace, Replace all instances of "foo" with  
"bar". The instances of "foo" in the change-tracked deleted text have  
now been replaced with instances of "bar", but they are no longer  
deleted. This is unexpected -- at least by me.

Bennett