webrev cannot detect A.java removal if I create a new directory A/java. Try this script:

mkdir x
cd x
hg init
touch A.java
hg commit -A -m 1
hg rm A.java
mkdir -p A/java
touch A/java/x
hg add
hg st
webrev.ksh

It only shows A/java/x added.

If the directory name is A/jav, webrev shows both A.java and A/jav/x.