Spyder: Different extension files syntax coloring bug

Description of your problem

What steps will reproduce the problem?

1. Edit file with extension different than Python sources (tested with .ini and .sql) opened in editor
2. Change tab
3. Save all files

What is the expected output? What do you see instead?
I expect to just save the files, instead, when I come back to the file, the syntax coloring is gone. The text is now monocolor.

Please provide any additional information below
The coloring seems to refresh and come back to normal if I edit any character. It also works if I save it with the tab active. This has been happening since several versions before but I finally noticed the pattern.

Versions and main components

• Spyder Version: 3.2.6
• Python Version: 3.6.3
• Qt Version: 5.6.2
• PyQt Version: 5.6.0
• Operating system: Windows 10 (up-to-date)

Dependencies

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

IPython >=4.0 : 6.2.1 (OK)
cython >=0.21 : 0.27.3 (OK)
jedi >=0.9.0 : 0.11.0 (OK)
nbconvert >=4.0 : 5.3.1 (OK)
numpy >=1.7 : 1.13.3 (OK)
pandas >=0.13.1 : 0.22.0 (OK)
pycodestyle >=2.3: 2.3.1 (OK)
pyflakes >=0.6.0 : 1.6.0 (OK)
pygments >=2.0 : 2.2.0 (OK)
pylint >=0.25 : 1.7.4 (OK)
qtconsole >=4.2.0: 4.3.1 (OK)
rope >=0.9.4 : 0.10.7 (OK)
sphinx >=0.6.6 : 1.6.3 (OK)
sympy >=0.7.3 : 1.1.1 (OK)