Nice, simple fix :)

We need to clear view->offset in the log view 'B', C-l, and backspace
case to prevent moving the selection cursor.

repro in got repo:
  $ tog (or tog tog)  # 80x24
  S  # switch to hsplit
  23j
  return
  tab  # focus log/top split
  C-l or B (or backspace)
  tab  # focus diff/bottom split
  q
  *log selection cursor will move down*

This happens because the stored offset value is now bogus as we reset
all positions with the C-l or B or backspace key maps--we need to reset
view->offset too.

diff /home/mark/src/git/got-current
commit - 598eac4331d322ab9e91ee6864c54845e3a6e86c
path + /home/mark/src/git/got-current
blob - 491d7334d3a574341848941ad1da39adb80cd6f7
file + tog/tog.c
--- tog/tog.c
+++ tog/tog.c
@@ -3463,6 +3463,7 @@ input_log_view(struct tog_view **new_view, struct tog_
 		s->thread_args.commits_needed = view->lines;
 		s->matched_entry = NULL;
 		s->search_entry = NULL;
+		view->offset = 0;
 		break;
 	case 'r':
 		view->count = 0;

-- 
Mark Jamsek <fnc.bsdbox.org>
GPG: F2FF 13DE 6A06 C471 CA80  E6E2 2930 DC66 86EE CF68