tests/test-1102

diffstat: scale adds/removes proportionally to graph width

The previous method of scaling had a tendency to include graph lines that
went past the output width when the file with the most changes had a very
large number of changes.

#!/bin/sh

rm -rf a
hg init a
cd a
echo a > a
hg ci -Am0
hg tag t1 # 1
hg tag --remove t1 # 2

hg co 1
hg tag -r0 t1
hg tags