Fix autoindentation after data structures.

[rlaverde]

Fixes #1373

When a structure is defined in the same line, the autoindent was failing

[ccordoba12]

@rlaverde, could you provide an example of the old and new behaviors?

[goanpeca]

@rlaverde could we add a test for this behavior?

[rlaverde]

@ccordoba12 After writing an opening and closing brackets (declaring list, dicts, or sets ...) the autoindent was wrong

Old behavior: (The | is the cursor)

def somefunc(arg1,
             arg2=0,
             arg3=[1], <enter>

result:

def somefunc(arg1,
             arg2=0,
             arg3=[1],
|

Now:

def somefunc(arg1,
             arg2=0,
             arg3=[1], <enter>

result:

def somefunc(arg1,
             arg2=0,
             arg3=[1],
             |

[rlaverde]

@goanpeca There is already a test for this marked as xfail, now It's passing, should I remove the decorator @pytest.mark.xfail?

https://github.com/spyder-ide/spyder/blob/master/spyder/widgets/sourcecode/tests/test_autoindent.py#L73

[goanpeca]

@rlaverde yes :-), @jitseniesen I think you were working on those tests right?

[jitseniesen]

@jitseniesen I think you were working on those tests right?

No, @Nodd was working on auto indentation.

[ccordoba12]

Since tests are passing, I just have to merge :-)

Great work @rlaverde!

[jitseniesen]

@rlaverde Has this also fixed #3214?

[rlaverde]

@jitseniesen Yes, #1373 is like an specific case of #3214