Commit
25da274450b3021547fa950755e179281f90b722
by Thomas WolfMove FileDiff command handlers to separate Java package
Give them all a new abstract super class to factor out common things.
This also ensures that none of these command handlers depends on the
history page.
Change-Id: Id56dca2193605d005dd4eba0754d824e485d7afa
Signed-off-by: Thomas Wolf <twolf@apache.org>