[FIX] OWPreprocess: commit automatically for N-grams

[matejklemen]

Issue

Fixes #336.

Description of changes

Changed the connection of signal so that it is consistent with how it's done in FilteringModule (the other place where RangeWidget is used).

Includes

• Code changes
• Tests
• Documentation

[ajdapretnar]

This works well! Thanks!
Could you perhaps add some tests? 🤔
I will restart Travis, because it doesn't seem to exit on this issue.

[matejklemen]

Sorry for the late reply - I'll try to figure something out for tests when I find some time

[ajdapretnar]

Sure, no worries. 👍
Could you also rebase to latest master so that the tests would pass? We fixed a couple of things by now.

[s-alexey]

It seems like there is a problem with RagneWidget.valueChanged signal as well. I think we could drop it as no longer used.

[codecov-io]

Codecov Report

Merging #409 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #409   +/-   ##
=======================================
  Coverage   85.96%   85.96%           
=======================================
  Files          34       34           
  Lines        1931     1931           
  Branches      331      331           
=======================================
  Hits         1660     1660           
  Misses        230      230           
  Partials       41       41

[ajdapretnar]

I am sorry @matejklemen for the mess I have made today. Especially messing with your branch. Apologies! 🙏

I made a new PR with your commit in #436. If tests pass, I will merge it. You remain the author of the code.

Thank you for this fix!

[ajdapretnar]

Continued in #436.