This fixes another regression that was introduced in b967135d ("gitk:
Synchronize highlighting in file view when scrolling diff"): when
searching for a string in tree mode, jumping to the next search hit
would highlight the "Comments" entry in the file list.
Signed-off-by: NStefan Haller <stefan@haller-berlin.de>
Signed-off-by: NPaul Mackerras <paulus@samba.org>