gitk: Don't try to show local changes from a head that isn't shown
When updating the display, if the checked-out head has moved on and
isn't currently shown, and there are local changes, we could try to
insert a fake row with a parent that isn't displayed, leading to a
Tcl error. This is because we check whether the checked-out head
is displayed before rereading the references (which is when we discover
that the head has moved). This fixes it.
Signed-off-by: NPaul Mackerras <paulus@samba.org>
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