Watershed: consider connectivity when calculating markers.

[divyank0]

Description

here, we pass the user supplied parameter connectivity to ndi.label function instead of using default parameter value.
Changes also include the test case to cover the difference that may arise due to the change in code.

closes #5084

For reviewers

• Check that the PR title is short, concise, and will make sense 1 year
  later.
• Check that new functions are imported in corresponding __init__.py.
• Check that new features, API changes, and deprecations are mentioned in
  doc/release/release_dev.rst.

[pep8speaks]

Hello @divyank0! Thanks for updating this PR. We checked the lines you've touched for PEP 8 issues, and found:

• In the file skimage/segmentation/_watershed.py:

Line 76:80: E501 line too long (82 > 79 characters)

• In the file skimage/segmentation/tests/test_watershed.py:

Line 499:62: W291 trailing whitespace
Line 518:51: E251 unexpected spaces around keyword / parameter equals
Line 518:53: E251 unexpected spaces around keyword / parameter equals
Line 518:56: E226 missing whitespace around arithmetic operator

Comment last updated at 2021-03-14 10:12:44 UTC

[rfezzani]

Thank you for this contribution @divyank0, very clean! 😉

[jni]

Perfect! 🎉 Thanks @divyank0!