Arch Linux

Description:
meld's treehelper explicitly raises StopIteration which is incompatible with python 3.7

Additional info:
* meld 3.19.0-2
* upstream fix https://gitlab.gnome.org/GNOME/meld/commit/bdf159110a99012f549039636209ec0c99a4715c

Steps to reproduce:
run meld from the console on two source trees containing sub directories with differing contents output below such as example below
meld hplip-3.18.6 hplip-3.18.7
/usr/bin/meld:206: PyGIDeprecationWarning: GObject.glib_version is deprecated; use GLib.glib_version instead
assert GObject.glib_version >= glib_requirement
Traceback (most recent call last):
File "/usr/lib/python3.7/site-packages/meld/treehelpers.py", line 111, 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/python3.7/site-packages/meld/dirdiff.py", line 1090, in on_treeview_cursor_changed
prev, next = self.model._find_next_prev_diff(cursor_path)
File "/usr/lib/python3.7/site-packages/meld/tree.py", line 173, in _find_next_prev_diff
return self.get_previous_next_paths(start_path, match_func)
File "/usr/lib/python3.7/site-packages/meld/treehelpers.py", line 122, in get_previous_next_paths
for it in self.inorder_search_up(start_iter):
RuntimeError: generator raised StopIteration
Traceback (most recent call last):
File "/usr/lib/python3.7/site-packages/meld/treehelpers.py", line 111, 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/python3.7/site-packages/meld/dirdiff.py", line 1090, in on_treeview_cursor_changed
prev, next = self.model._find_next_prev_diff(cursor_path)
File "/usr/lib/python3.7/site-packages/meld/tree.py", line 173, in _find_next_prev_diff
return self.get_previous_next_paths(start_path, match_func)
File "/usr/lib/python3.7/site-packages/meld/treehelpers.py", line 122, in get_previous_next_paths
for it in self.inorder_search_up(start_iter):
RuntimeError: generator raised StopIteration