Bug#822993: meld: In directory comparison, drop-down menu for file filters is not positioned correctly

[Kyanos]

Package: meld
Version: 3.14.2-1
Severity: minor

Dear Maintainer,

When running a directory comparison, there is a "Filters" button to set
file filters (for example, to ignore backup files in the diff).

When I click that button, the drop-down box does not appear under the
button as expected. Instead, it appears at the top-left corner of the
desktop. Also, the following error message appears on standard output
every time I click it:

> TypeError: position_menu_under_widget() takes exactly 2 arguments (4
given)

Thank you for your consideration.

Kyanos

-- System Information:
Debian Release: stretch/sid
  APT prefers testing
  APT policy: (500, 'testing'), (300, 'oldstable-updates'), (300,
'oldstable')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.5.0-1-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_US.utf8, LC_CTYPE=en_US.utf8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages meld depends on:
ii  dconf-gsettings-backend [gsettings-backend]  0.26.0-1
ii  gir1.2-gtksource-3.0                         3.18.2-1
ii  libcanberra-gtk3-module                      0.30-3
ii  libgtk-3-0                                   3.18.9-1
ii  libgtksourceview-3.0-1                       3.18.2-1
ii  patch                                        2.7.5-1
ii  python                                       2.7.11-1
ii  python-gi                                    3.20.0-2
ii  python-gi-cairo                              3.20.0-2
pn  python:any                                   <none>

Versions of packages meld recommends:
pn  yelp  <none>

meld suggests no packages.

-- no debconf information