Crash in "New window" when opening new file.

[pnavarre]

Description of your problem

What steps will reproduce the problem?

1. Open Spyder. On the tab of the current file open in Editor, I right-click and select "New window". A new window with Editor and the current file opens correctly.
2. In the new window I click "Open file" icon. In the "Open file" window I select a second file to open, click on it (turns blue) and then click "Open" button.
3. After pressing "Open" Spyder crashes with message:
   27558 Segmentation fault (core dumped) spyder3

What is the expected output? What do you see instead?
I expect Spyder to open the new file in the Editor (in both windows open). Instead, Spyder crashes.

Please provide any additional information below

When writing this issue it took me long time to execute each step and then Spyder didn't crash. Then I repeated following the steps without waiting and crashes again. Also, the first time I noticed the issue Spyder hanged for long time before crashing.

I use a virtual environment with Python 3.5.3 on Ubuntu 16.04. I install PyQt5 v5.7.1 from pip. This comes with a local copy of Qt (v5.7.1) so it doesn't mess with the Ubuntu Qt. I compile Spyder 3.1.2 from source in the virtual environment with all necessary dependencies (see below).
Probably unrelated, but I also use nvidia driver which has an issue reported in #3226. I fix it manually according to the post, using PyOpenGL.

Versions and main components

• Spyder Version: 3.1.2
• Python Version: 3.5.3
• Operating system: Ubuntu LTS 16.04

Dependencies

Please go to the menu entry Help > Optional Dependencies (or
Help > Dependencies), press the button Copy to clipboard
and paste the contents below:

jedi >=0.8.1 : 0.9.0 (OK)
matplotlib >=1.0 : 2.0.0 (OK)
nbconvert >=4.0 : 5.1.1 (OK)
numpy >=1.7 : 1.12.0 (OK)
pandas >=0.13.1 : 0.19.2 (OK)
pep8 >=0.6 : 1.7.0 (OK)
psutil >=0.3 : 5.0.1 (OK)
pyflakes >=0.6.0 : 1.5.0 (OK)
pygments >=2.0 : 2.2.0 (OK)
pylint >=0.25 : 1.6.5 (OK)
qtconsole >=4.2.0: 4.2.1 (OK)
rope >=0.9.4 : 0.10.3 (OK)
sphinx >=0.6.6 : 1.5.2 (OK)
sympy >=0.7.3 : 1.0 (OK)