Bug#916842: Bug in Meld 3.18.3 fixed in 3.19.1

[Paul-Antoine Arras]

Package: meld
Version: 3.18.3-1

When using tree diff, Meld throws the following error several times:
```
Traceback (most recent call last):
   File "/usr/lib/python3/dist-packages/meld/tree.py", line 204, in 
inorder_search_up
     raise StopIteration()
StopIteration

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
   File "/usr/lib/python3/dist-packages/meld/dirdiff.py", line 1108, in 
on_treeview_cursor_changed
     prev, next = self.model._find_next_prev_diff(cursor_path)
   File "/usr/lib/python3/dist-packages/meld/tree.py", line 215, in 
_find_next_prev_diff
     for it in self.inorder_search_up(start_iter):
RuntimeError: generator raised StopIteration
```
This has been reported and fixed upstream in 3.19.1.

References:
https://gitlab.gnome.org/GNOME/meld/issues/217
https://gitlab.gnome.org/GNOME/meld/commit/bdf159110a99012f549039636209ec0c99a4715c
https://gitlab.gnome.org/GNOME/meld/tags/3.19.1
-- 
Paul-Antoine Arras
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