commit 7bf216df63c07ec095dc1a146dfd4cf70ca32293
author Ole <oler@google.com> Thu Sep 24 15:48:18 2020 +0200
committer Ole <oler@google.com> Fri Sep 25 17:56:53 2020 +0200
tree c55307f06d63e08ff4b97489b4afa234f3b6f724
parent c7ea9c3dbe3b38b43674f554e61cb46acee65671

Move next-file-toast to gr-diff-cursor

gr-cursor-manager is a generic utility for handling cursor stops - apart
from this code it does not know anything about files or diffs.
gr-diff-cursor is actually the only place that passes in the boolean to
show this toast, and is probably the cleaner place to hold this logic in
the first place.

This changes the behavior slightly:
Before, when showing the toast, it would keep the index at the last
position, but not add the CSS treatment to look selected and so on.
I would argue that leaves gr-cursor manager in an inconsistent state.
Now, we still clip to the end, keep the CSS treatment on the last line
and so on, and also show the toast.

I find it also a bit inconsistent that this toast works for next chunk
but not
1) next comment
2) previous chunk
However, this can be fixed separately and is not affected by this
change.

Change-Id: Ie77586d2ccd5e41b25b07aba9563b16ec5943a28