Auto indentation may include too many indents

[brodders61]

Description of your problem

What steps will reproduce the problem?

1. use Spyder editor, hit return
2. either will be OK or persistently:
3. generates multiple (excessive) indents
4. once suffering this effect, Sypder uses it consistently as if auto-indent has got wrong idea where things should be and wants to stick to that opinion

Example

for some text:
   working normally
                                    suddenly borked
   user del's to here but on next RETURN
                                    back to here again, forever on every RETURN

Versions and main components

• Spyder Version: 3.1.2
• Python Version: 2.7.13 64bit
• Qt Version: 5.6.2
• PyQt Version: 5.6
• Operating system: Win 7

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 : 4.2.0 (OK)
numpy >=1.7 : 1.11.3 (OK)
pandas >=0.13.1 : 0.19.2 (OK)
pep8 >=0.6 : 1.7.0 (OK)
pyflakes >=0.5.0 : 1.5.0 (OK)
pygments >=2.0 : 2.1.3 (OK)
pylint >=0.25 : 1.6.4 (OK)
qtconsole >=4.2.0: 4.2.1 (OK)
rope >=0.9.4 : 0.9.4 (OK)
sphinx >=0.6.6 : 1.5.1 (OK)
sympy >=0.7.3 : 1.0 (OK)

[ccordoba12]

Thanks for reporting. This is a duplicate of issue #4096.